Condition

Hives (Urticaria)

Hives are raised, itchy welts that come up fast, move around the body, and each fade within a day. Most cases settle on their own, and the long-running ones are usually controlled with a daily antihistamine rather than by finding something to avoid.
Dr. Schwarz, MD · Board-certified dermatologistLast reviewed September 8, 2026
16:9 hero for Hives (Urticaria). Never cropped: the tone strip and the corner logo depend on the full frame.

Start here

Almost everyone who comes in with hives wants a reason — what did I eat, what did I touch, what is in my house. In most long-running cases we never find one, and that is not bad news, because chronic hives are usually the immune system switching itself on from the inside, so there is nothing you did to cause it and nothing you can remove to stop it. The exhausting search through foods and detergents can stop. What matters instead is treatment, because the mistake I see most often is taking an antihistamine only on bad days, when hives respond far better to a steady daily dose that blocks histamine before welts form, and most chronic hives eventually burn out on their own.

— Dr. Schwarz, Board Certified Dermatologist

Key Facts

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How commonRoughly one in five people get hives at some point in their life
Who gets itAny age. Short-lived hives are common in children; the chronic form is most common in adults, and more often in women
Curable or managedShort-lived hives clear on their own. Chronic hives are managed until they settle, which most eventually do
Prescription neededNot always. Over-the-counter antihistamines are the first treatment
Time to improveAntihistamines work within hours. Chronic hives usually take months to years to go away for good

What It Is

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A hive is a patch of skin swollen because fluid has leaked out of small blood vessels into the tissue around them. One is called a wheal. It is raised, often pale in the middle with a pink or slightly darker rim, and it itches rather than hurts. Press a fresh one and the color fades for a moment.

What separates hives from nearly every other rash is that each welt is temporary. One hive lasts minutes to hours and is gone within a day, leaving the skin exactly as it was. New ones arrive as old ones fade, so the rash seems to travel. A spot that stays fixed for more than a day, burns or aches more than it itches, or leaves a bruise or a stain, is probably not a hive — which changes the diagnosis and the treatment.

Many people with hives also get deeper swelling, called angioedema. It is the same leaking lower in the skin — puffy lips, eyelids, hands, feet or genitals rather than a welt. It looks alarming and usually is not dangerous. Swelling of the tongue or throat, or hives with trouble breathing, dizziness or vomiting, needs emergency care straight away.

Hives are sorted by how long they have lasted, not how they look. Under six weeks is acute urticaria. Six weeks or more, on most days, is chronic urticaria. That line separates a one-off reaction that often has a findable trigger from a long-running condition where testing rarely turns anything up.

Symptoms

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Welts lasting under six weeks

Acute

Raised, itchy welts that appear quickly, move around the body and each fade within 24 hours without leaving a mark. Infections, medicines and foods are common triggers. Most settle within days to weeks.
Welts coming back for months

Chronic

Hives that keep returning on most days for more than six weeks, often with no trigger ever found. This is frustrating rather than dangerous, and the search for a cause is usually less useful than steady treatment. It commonly settles on its own over time.
Puffy lips or eyes

With Swelling

Deeper swelling of the lips, eyelids, hands or feet along with the welts, which feels tight rather than itchy and takes longer to fade. Swelling of the tongue or throat, or any trouble breathing, is an emergency.

How It Looks by Skin Tone

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Large raised welts across an upper back on light skin. The welts are pink to red with paler swollen centers, and the edges stand clearly above the surrounding skin.Raised welts across an upper back on medium olive-toned skin. The welts read dusky pink to light brown rather than bright red, with edges raised above the surrounding skin.Raised welts across an upper back on brown skin. The welts read close to skin-colored with a faint violet tone, and the raised edges show mainly as soft shadows.Raised welts across an upper back on deep brown skin. The welts read skin-colored to faintly darker rather than red, and a few flat darker marks sit where earlier welts were scratched.
LightMediumBrownDeep

On deeper skin tones the redness of a hive is the least visible part. A welt a textbook calls bright red may read as skin-colored, brown or faintly violet, and the swelling is easier to feel with a hand than to see in a mirror. The reliable signs are the raised edge, the itch, and each welt being gone within a day.

That has two effects. Hives on deeper skin get called mild, or missed in photographs sent to a clinic, and people are treated less than they need. A photo in strong side lighting, which shadows the raised edge, shows the swelling far better than a straight-on flash. The other is what scratching leaves behind. Hives heal without a trace; scratching does not. Rubbed and scratched skin on deeper skin tones heals into flat dark marks, called post-inflammatory hyperpigmentation, that routinely take months to fade — far longer than the hives lasted. Controlling the itch early is how you avoid a pattern of marks after the hives have finished.

Where It Shows Up

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Front view of a whole body with red marks scattered over the chest, abdomen, waist, both arms and both legs.
Anywhere, and moving
Hives can appear anywhere on the body, and the trunk and the limbs are the usual places. What matters more than the site is the movement: any single welt fades within a day and a new one comes up somewhere else. A welt that stays in one spot for more than a day, bruises, or leaves a mark behind is a different thing and should be looked at.
Front view of a head with red marks around both eyes, on the upper and lower lip, on both cheeks and on the neck.
Swelling of the lips and eyelids
Deeper swelling goes for the loose skin of the lips, the eyelids and the tongue. It is puffy rather than itchy and takes longer to settle. Swelling of the tongue or the throat, or any trouble breathing or swallowing, is an emergency.

What Happens in the Skin

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This is what is going wrong under the skin, in the order it happens. Click a step to see it.

How Hives (Urticaria) happens
Skin basics
BARRIEREPIDERMISDERMIS0NORMAL SKIN1A TRIGGER REACHES THE MAST CELL2THE MAST CELL RELEASES HISTAMINE3BLOOD VESSELS LEAK INTO A WELT4NERVE ENDINGS FIRE, THE ITCH

Mast cells sit throughout healthy skin, each one loaded with tiny packets of histamine. Nothing is switching them on, so the packets stay shut. The small blood vessels beside them hold their fluid in, and the surface stays flat.

Mast cells sit in the skin loaded with packets of histamine. Something reaches one and switches it on: an infection, a medicine, pressure or cold in some people, and in long-running hives usually the body's own antibodies rather than anything outside.

The cell empties its packets into the tissue around it within seconds. This is the step omalizumab acts on, and it is the reason a tablet taken after the welts appear is already behind the problem.

Histamine makes nearby blood vessels widen and turn leaky, and the fluid that escapes lifts the skin into a raised welt. Nothing is damaged, which is why a hive fades within a day and leaves no mark. Antihistamines work by blocking the receptor this step depends on.

The same histamine irritates nerve endings in the skin, and that is the itch. Scratching presses on the skin, which sets more mast cells off, so the itch feeds itself. Almost everything on the lists below is pushing on this loop.

The outer film of dead cells and oil. It holds water in and keeps irritants out, and it is thinner than a sheet of paper. Almost every dry, itchy, stinging skin problem starts here.

The outer layer, and the only one anything in a jar reaches. It renews itself constantly: a cell made at the bottom takes about a month to reach the surface and flake off. Most of what a skincare product does, it does here.

The living layer underneath, holding the blood vessels, the nerves and the collagen. It is where lasting change happens and it is hard to reach: most of what is sold for the skin never gets this far.

Whatever sets a hive off, the hive forms through the same four steps.

A trigger reaches a mast cell — an immune cell in the skin loaded with packets of histamine and other chemicals. The mast cell switches on and empties those packets into the tissue. Histamine makes nearby blood vessels widen and leak, and the escaping fluid lifts the skin into a raised welt. That same histamine irritates nerve endings, which is the itch.

Only the first step differs between people. In short-lived hives the trigger is often an infection, a medicine, an insect sting or a food. In chronic hives the switch is usually flipped from the inside — in a large share of cases the body makes antibodies that turn the mast cell on directly. That is autoimmune rather than allergy, even though the rash looks identical, and why hunting for an external cause comes up empty.

Risk Factors

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Most people who get hives have no risk factor, so a single episode rarely needs explaining. A few make hives more likely, and some point toward the chronic form.

Triggers
Recent infection
The commonest trigger in children, and frequent in adults. A cold, throat infection or stomach bug can set hives off for a week or two.
Triggers
Physical triggers
Some mast cells fire from pressure, scratching, cold, heat, vibration or water. The hives appear where they were provoked.
Triggers
Certain medicines
Aspirin and other anti-inflammatory painkillers, opioids and ACE inhibitors. Never stop a prescribed medicine on your own — ask your doctor.
Immune conditions
Autoimmune thyroid disease
The commonest companion to chronic hives. It does not cause them, but points to an immune system attacking itself.
Immune conditions
Other autoimmune conditions
Celiac disease, vitiligo, type 1 diabetes and rheumatoid arthritis show up more often with chronic hives.
Immune conditions
A history of allergy or eczema
A mild link only. Hives are common with no allergic history.
Age & sex
Being female
Chronic hives are about twice as common in women, often starting in the twenties to forties.

Course

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Hives run one of two courses, and which one is clear after about six weeks. They do not scar and do not damage the skin, however severe a flare looks. Anything left behind is a mark from scratching.

First hoursThe start
Welts appear in waves

Hives come on over hours, often after an infection that may already be over by the time they appear.

First two weeksThe acute form
Most hives are finished by now

Short-lived hives are what most people get, usually over within one to two weeks. Nothing needs doing beyond controlling the itch.

Six weeksThe dividing line
Chronic hives are diagnosed here

Chronic hives are diagnosed once welts have been appearing on most days for six weeks or more.

MonthsLiving with the chronic form
It waxes and wanes

Welts come and go, often with clear stretches of days or weeks between, and are worse in the evening and overnight. Severity moves around for no visible reason.

A year or a fewHow the chronic form ends
It burns out

This burns out rather than being something you have for life. Many people are clear within a year, most within a few years, a minority longer. Treatment does not shorten that clock, but it means you wait it out comfortably instead of miserably, and it is stepped down gradually once the skin has been quiet a while.

What Makes It Better & Worse

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Hives is not one problem, it is four — a trigger reaching the mast cell, histamine released, vessels leaking into a welt, and nerve endings firing as itch. Almost none of it is allergy, and nearly all the benefit comes from steps two and three, which is why avoiding foods rarely helps.

What is driving yours?

FATBARRIEREPIDERMISDERMIS

Mast cells sit in the skin loaded with packets of histamine. Something reaches one and switches it on: an infection, a medicine, pressure or cold in some people, and in long-running hives usually the body's own antibodies rather than anything outside.

The cell empties its packets into the tissue around it within seconds. This is the step omalizumab acts on, and it is the reason a tablet taken after the welts appear is already behind the problem.

Histamine makes nearby blood vessels widen and turn leaky, and the fluid that escapes lifts the skin into a raised welt. Nothing is damaged, which is why a hive fades within a day and leaves no mark. Antihistamines work by blocking the receptor this step depends on.

The same histamine irritates nerve endings in the skin, and that is the itch. Scratching presses on the skin, which sets more mast cells off, so the itch feeds itself. Almost everything on the lists below is pushing on this loop.

What helps

  • Loose clothing Soft layers with no tight bands remove the pressure trigger.
  • Treating a thyroid problem Worth doing anyway, though it rarely clears the hives.
  • Two weeks of notes, then stop If nothing lines up in two weeks, nothing will.

What makes it worse

  • Pressure on the skin Tight waistbands, bra straps and bag straps raise welts.
  • Infections A cold or stomach bug can restart settled hives.

What helps

  • Keeping cool A cool room, lighter bedding, lukewarm showers, cold packs.
  • Omalizumab A monthly injection acting on the mast cell itself.
  • Time Chronic hives resolve on their own in most people.

What makes it worse

  • Scratching and rubbing Pressure is itself a trigger, so scratching makes more hives.
  • Heat Hot showers, hot rooms and heavy bedding lower the firing threshold.
  • Alcohol Widens blood vessels and adds to the leaking.
  • Anti-inflammatory painkillers Aspirin, ibuprofen and naproxen worsen hives in a substantial minority.
  • Stress and broken sleep Neither causes hives; both lower the threshold.
  • Hot showers for the itch Relief lasts minutes; the rebound itch is worse.

What helps

  • A daily non-drowsy antihistamine Cetirizine, loratadine, fexofenadine or bilastine.
  • Taking it in the morning Block the receptor before the day starts.
  • A higher dose, supervised Guidelines allow up to four times the standard dose.
  • A short course of steroid tablets For a severe flare, a few days at most.

What makes it worse

  • Taking it only when hives appear It then chases histamine already out.
  • Stopping too early The condition has not ended, only the block on it.

What helps

  • Calamine or menthol lotion Nothing to the hives, but it dulls the itch.

How These Treatments Work

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Treatments for Hives (Urticaria) do not all work in the same place. Tap one to see where it acts.

Pick a treatment
Skin basics
BARRIEREPIDERMISDERMISBLOCKS THE HISTAMINEBLOCKS THE HISTAMINEBLOCKS THE TRIGGERREMOVES THE TRIGGERSHORT-TERM ONLY

Mast cells release histamine, which makes vessels leak and the welt rise. This blocks that.

Standard doses often are not enough, and doctors go well above them for hives.

Works a step earlier, before the mast cell is told to fire. For hives lasting months.

Useful when there is a clear one. In long-lasting hives there often is not.

Useful in a bad flare, and not a treatment to stay on.

The outer film of dead cells and oil. It holds water in and keeps irritants out, and it is thinner than a sheet of paper. Almost every dry, itchy, stinging skin problem starts here.

The outer layer, and the only one anything in a jar reaches. It renews itself constantly: a cell made at the bottom takes about a month to reach the surface and flake off. Most of what a skincare product does, it does here.

The living layer underneath, holding the blood vessels, the nerves and the collagen. It is where lasting change happens and it is hard to reach: most of what is sold for the skin never gets this far.

Over-the-Counter Products

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Everything here you can buy without seeing anyone.

Cetirizine
Cetirizine
Strong evidence
The usual first treatment: one non-drowsy antihistamine tablet, taken every single day while the hives last, not only on bad days. It blocks the receptor before histamine reaches it, which is why a steady daily dose does far more than a tablet after the welts appear. It makes a minority of people slightly sleepy, so some take it at night.
Fexofenadine or loratadine
Fexofenadine or loratadine
Strong evidence
Equally good alternatives if cetirizine makes you drowsy or is not working well for you. They are worth swapping between, because people respond differently to each one for no clear reason. Same rule: every day, ideally in the morning, for as long as the hives are active. Bilastine is another option where it is available.
A white cream tube lying on its side on a white background, with a plain white label reading Calamine and a yellow swoosh beneath it.
Calamine or menthol lotion
Limited evidence
Dabbed on a bad patch, it cools the skin and dulls the itch for a while. A cold pack does much the same. Neither does anything to the hives themselves or to how long they last, but taking the edge off the itch is worth doing, because scratching raises more welts and leaves marks.
Five colloidal oatmeal eczema products lined up on white: tubes, a jar and a pump lotion16:9 hero for Colloidal Oatmeal. Never cropped: the tone strip and the corner logo depend on the full frame.
Weak evidence
A lukewarm oatmeal bath can settle the itch for an hour or so. Keep the water cool rather than hot, because heat lowers the threshold at which mast cells fire and a hot shower makes hives worse once the relief wears off. This is comfort only and no substitute for the daily antihistamine.
Diphenhydramine (Benadryl)
Diphenhydramine (Benadryl)
Weak evidence
An older antihistamine still widely reached for in hives. It works, but it wears off in four to six hours, it makes most people drowsy, and next-day grogginess and confusion are a real problem in older adults. Guidelines now recommend the non-drowsy tablets instead, taken daily, and keep this one for occasional use at most.

Prescriptions

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These need a prescription.

A white cream tube lying on its side on a white background, with a plain white label reading Steroid Cream and a blue swoosh beneath it.
Topical steroid creams
Weak evidence
Steroid creams are commonly handed out for hives and they do not work for them. The problem is histamine released deep in the skin across the whole body, not inflammation in one patch, and a cream cannot reach or cover it. Hives are treated with tablets. A cream is only useful for a different, fixed rash that has been mistaken for hives.
An amber prescription bottle lying on its side on a white background with a plain white label reading Antihistamines, and six small round white tablets spilled out in front of it.
Higher-dose antihistamine
Strong evidence
The single most useful step when a standard dose is not holding. Guidelines allow up to four times the usual daily dose of a non-drowsy antihistamine for hives, and many people who thought antihistamines had failed simply had not been given enough. This is your doctor's decision, not something to scale up on your own.
An amber pill bottle labeled Cyclosporine tipped over with white tablets spilling out16:9 hero for Cyclosporine. Never cropped: the tone strip and the corner logo depend on the full frame.
Moderate evidence
An immune-suppressing tablet used for severe chronic hives that have not responded to high-dose antihistamines, usually when omalizumab is unavailable or has not worked. It is effective. It needs blood pressure and kidney monitoring, so it is used for months rather than open-endedly, and it is a specialist decision.
An amber prescription bottle lying on its side on a white background with a plain white label reading Montelukast, and six small round white tablets spilled out in front of it.
Montelukast
Limited evidence
An asthma tablet sometimes added to an antihistamine for chronic hives, particularly where anti-inflammatory painkillers make them worse. The evidence for it is mixed and the benefit is modest at best. It carries a warning about mood changes and disturbed sleep, so it is worth a defined trial rather than staying on it indefinitely.
16:9 hero for Prednisone. Never cropped: the tone strip and the corner logo depend on the full frame.Diagram: how Prednisone works in the skin
Limited evidence
A short course of steroid tablets, three to five days, to break a severe flare. That is where their usefulness ends. Used repeatedly they cause weight gain, bone loss, blood sugar problems and rebound flares, so steroids are never the long-term plan for hives. If you are needing them more than occasionally, the daily treatment needs changing instead.
An amber prescription bottle lying on its side on a white background with a plain white label reading Famotidine, and six small round white tablets spilled out in front of it.
Famotidine
Weak evidence
A stomach-acid tablet that blocks a second type of histamine receptor, sometimes added to a standard antihistamine. The trials behind it are small and unconvincing. It is cheap and well tolerated, so it is occasionally tried as an add-on, but raising the dose of the main antihistamine helps far more.
A white injector pen on a white background, with a plain white label reading Omalizumab and a blue swoosh beneath it.
Omalizumab
Strong evidence
An injection given once a month for chronic hives that high-dose antihistamines have not controlled. It acts on the mast cell itself rather than on histamine already released, and it clears or nearly clears the hives in a large share of people, often within weeks. It is a specialist treatment, it is continued for months, and hives can return when it is stopped, though many people have burnt out by then.
A white injector pen on a white background, with a plain white label reading Epinephrine and a blue swoosh beneath it.
Epi-Pen
Strong evidence
Not a treatment for hives, and most people with hives never need one. It is prescribed when hives have come with swelling of the tongue or throat, trouble breathing or faintness, because that is anaphylaxis and it is the only thing that treats it. If you have been given one, carry it and use it early rather than waiting to see.

Procedures

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These are done in the office, usually over several visits.

No procedures listed yet.

When to See a Dermatologist

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If hives come with swelling of the tongue, throat or mouth, trouble breathing or swallowing, lightheadedness or vomiting, go to an emergency department — that can be anaphylaxis. Otherwise book a routine appointment if hives have been appearing on most days for more than six weeks, if an over-the-counter antihistamine at the standard dose is not controlling them, if the welts burn or hurt rather than itch, if a single welt stays in one place for more than 24 hours or leaves a bruise or stain, if hives come with fever, joint pain or feeling generally unwell, or if they started within days of a new medicine. No blood test says yes or no to hives, so bring photographs taken during a flare in side lighting — the welts are usually gone by the appointment. Testing stays narrow — nothing under six weeks, and a blood count, an inflammation marker and thyroid tests for chronic hives — because broad allergy panels turn up positives that do not match real reactions.

— Dr. Schwarz, Board Certified Dermatologist

Complications

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Angioedema, the deeper swelling

The same leaking happening lower in the skin, showing as puffiness of the lips, eyelids, hands, feet or genitals rather than as a welt. It feels tight rather than itchy and takes a day or two to go down, and it happens alongside hives in many people. It looks alarming and is usually not dangerous. Swelling of the tongue or throat, or hives with trouble breathing, dizziness or vomiting, is a different situation and needs emergency care straight away.

Lost sleep and exhaustion

Hives are typically worst in the evening and overnight, so broken sleep is the part of this condition people feel most. Months of it wears down mood, concentration and work. It is not a sign the hives are dangerous, and it is a good reason to get the treatment dosed properly rather than to tough it out. A daily antihistamine taken in the morning, and a cool room and light bedding at night, is what most people need.

Lookalikes

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Contact Dermatitis

Both are itchy and both can come up on skin that touched something. A contact reaction stays exactly where the contact was, builds over a day or two, and is still there in the same shape days later, often dry, scaly or blistered by then. A hive appears in minutes to hours, wanders to new places, and each welt is gone within a day leaving smooth skin behind.

Eczema

Both itch badly and both can look pink and swollen in a flare, and children often get both. Eczema sits in the same places week after week, especially the inner elbows and behind the knees, and the skin there is dry, rough and thickened between flares. Hives leave no dry skin at all, move around the body, and each welt clears within 24 hours.

Cellulitis

A single large hive on a leg or a swollen eyelid can be mistaken for a skin infection, and the mistake is often made the other way round in emergency departments. Cellulitis is one fixed area that grows over days, feels hot and sore rather than itchy, and usually comes with fever and feeling unwell. Hives itch, move, and each patch has gone within a day.

Myths

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  • "Hives always mean a food allergy." A true food allergy causes hives within minutes, alongside symptoms elsewhere — lips, gut, breathing — every time that food is eaten. Chronic hives that come and go for weeks behave nothing like that; food is rarely the answer.
  • "There must be something in my house doing this." In chronic hives the immune system is switching the mast cells on from the inside. There is often nothing outside to find, which is why replacing detergents, pillows and shampoos rarely helps.
  • "I need allergy testing to sort this out." For hives lasting more than six weeks, broad allergy panels almost never explain them and often produce results positive on paper and meaningless in real life. Testing is useful when the history points at something specific.
  • "Antihistamines only work if you take them when you get hives." The opposite is closer to true. They occupy the receptor before histamine reaches it, so a steady daily dose beats a tablet taken after welts appear.
  • "Hives mean my immune system is weak." Chronic hives are the immune system overactive in one narrow way, not failing. It does not make you more prone to infection.
  • "Steroids are the real treatment." Steroid tablets clear a bad flare quickly and that is where their usefulness ends. Used repeatedly they cause weight gain, bone loss, blood sugar problems and rebound flares. Antihistamines first, steroids rarely.
  • "Hives leave scars." They do not Every welt fades without a trace. Any mark left behind came from scratching.
  • "Stress caused this." Stress makes existing hives fire more easily, but it does not start the condition, and being told it is stress delays proper treatment.

Questions Patients Ask

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How long will this last?

Under six weeks, most clear within one to two weeks and do not come back. Longer than six weeks, the honest answer is months to years, most clear within a few years. It ends, but not on a schedule anyone can predict.

Why can't anyone find the cause?

Because in chronic hives there usually is no outside cause. The immune system is switching the mast cells on directly. That is a real process, not a gap in the testing, and more searching will not change it.

Is it something I'm eating?

Almost never, in the chronic form. A genuine food allergy produces hives within minutes, every time, usually with symptoms beyond the skin. Hives that wander through the week without lining up with meals are not a food allergy, and elimination diets deliver nothing.

Can I take an antihistamine every day for months?

Second-generation antihistamines are designed for exactly that and are taken daily for long stretches under medical supervision. They do not stop working over time. Doses above the standard one are your doctor's decision.

Are hives dangerous?

The rash is not. It is uncomfortable and exhausting rather than harmful, and it does not damage skin. The dangerous situation is obvious — swelling of the tongue or throat, trouble breathing or swallowing, or feeling faint, which needs emergency care.

Will they leave marks?

Not from the hives. Each welt fades completely and the skin underneath is unchanged. Marks come from scratching, and on deeper skin tones those take months to fade — a good reason to treat the itch rather than tough it out.

References

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