Allergic Contact Dermatitis vs Irritant Contact Dermatitis

An itchy eczema rash caused by a delayed immune reaction to a substance touching the skin. Eczema caused by direct damage to the skin barrier rather than a specific allergy.

Research updated 2026-10-23

AI-generated educational illustration: Localized eczematous red mildly scaly patch on adult wrist at a contact site; intact skin.

AI-generated educational illustration: Adult hand with a dry red scaly irritated patch and mild fine fissuring; no deep cracks or bleeding.

Key differences What is it?What it looks like Diagrams When it starts Triggers Daily Care Treatment Outlook Complications When to get help Questions

Key differences

The same eight facts on every condition comparison.

Usual age

Any age

Where

Where the allergen touched

Hands and exposed areas

Main sign

Itchy eczema-like rash

Dry, red, cracked skin

Itch or pain

Very itchy

Burning, sore

Contagious

Long term

Clears when the trigger is avoided

Clears when exposure stops

Scars

Who gets it

Anyone sensitized to a substance

Wet work, cleaners, healthcare

What is it?

Allergic Contact Dermatitis

Irritant Contact Dermatitis

What is it?

What it is
An itchy eczema rash caused by a delayed immune reaction to a substance touching the skin.

What it is
Eczema caused by direct damage to the skin barrier rather than a specific allergy.

What it looks like

Allergic Contact Dermatitis

A pink-red patch on the inner wrist near the base of the hand.

Allergic Contact Dermatitis A localized patch of redness contrasts with the surrounding skin.

Irritant Contact Dermatitis

The back of a hand with a broad red rough-textured patch.

Irritant Contact Dermatitis Redness and fine scale extend across the back of the hand.

Skin tones

Localized eczematous red mildly scaly patch on adult wrist at a contact site; intact skin.

eczematous inflamed patches with scale and small bumps on the back of a hand on medium skin.

short linear streaks of inflamed papules and tiny vesicles on a forearm on brown skin.

an irregular eczematous patch with fine scale on the side of the neck on deep skin.

Adult hand with a dry red scaly irritated patch and mild fine fissuring; no deep cracks or bleeding.

Irritant Contact Dermatitis on medium skin.

Irritant Contact Dermatitis on brown skin.

Irritant Contact Dermatitis on deep skin.

In the skin

A sensitized immune system reacts to an allergen that touches the skin. The delayed inflammatory response produces a rash at or around areas of exposure.

Water, chemicals or friction damage the skin barrier faster than it can repair. The resulting inflammation does not require prior allergic sensitization.

When it usually starts

010203040506070+

Allergic Contact Dermatitis. Can start at any age after relevant exposures or barrier damage.

Irritant Contact Dermatitis. Can start at any age after relevant exposures or barrier damage.

Causes and triggers

Causes

An immune reaction develops after sensitisation; patch testing can help identify the allergen.

Water, chemicals or friction damage the skin faster than it can repair.

Risk factors

Prior sensitisation, Fragrances, Metals, Preservatives

Repeated wet work, Irritating products, Eczema tendency

Trigger

● Allergic Contact Dermatitis

● Irritant Contact Dermatitis

Contact with a relevant allergen

Can contribute

Not listed

Detergents

Not listed

Can contribute

Friction

Not listed

Can contribute

Repeated wetting

Not listed

Can contribute

Daily Care

Allergic Contact Dermatitis

Irritant Contact Dermatitis

Daily care

Habits that help

Apply fragrance-free moisturizer often and after washing
Use a plain cream or ointment that does not sting.
Wash with lukewarm water and a mild cleanser
Pat dry gently and keep necessary hand hygiene without unnecessary repeated washing.
Protect skin during wet work and cleaning
Use suitable protective gloves; cotton liners and breaks help prevent trapped sweat.
Use a cool damp compress for short-term itch relief
Keep nails short and protect sore skin from rubbing.
Follow your confirmed allergen-avoidance list
Patch testing can identify allergens; replacement products and gloves must also be free of the trigger.
Follow the allergic contact dermatitis care plan
Identify and avoid the confirmed allergen; use bland moisturizer. A clinician may recommend patch testing.

Avoid

Avoid: Fragrance, harsh detergents and known triggers
Read labels rather than assuming a natural or unscented product is safe.
Avoid: Picking, scratching or deliberately popping blisters
Broken skin increases pain and infection risk.

Habits that help

Apply fragrance-free moisturizer often and after washing
Use a plain cream or ointment that does not sting.
Wash with lukewarm water and a mild cleanser
Pat dry gently and keep necessary hand hygiene without unnecessary repeated washing.
Protect skin during wet work and cleaning
Use suitable protective gloves; cotton liners and breaks help prevent trapped sweat.
Use a cool damp compress for short-term itch relief
Keep nails short and protect sore skin from rubbing.
Reduce repeated exposure to the irritating substance
Change work methods or use appropriate barriers rather than relying on cream to cancel ongoing exposure.

Avoid

Avoid: Fragrance, harsh detergents and known triggers
Read labels rather than assuming a natural or unscented product is safe.
Avoid: Picking, scratching or deliberately popping blisters
Broken skin increases pain and infection risk.

Treatment differences

Evidence labels come from each condition’s own treatment list.

Treatment

● Allergic Contact Dermatitis

● Irritant Contact Dermatitis

Prescription topicals

Site-appropriate topical corticosteroid

Listed

Treats active eczema for a clinician-directed course; strength depends on site and age.

Site-appropriate topical corticosteroid

Listed

Treats active eczema for a clinician-directed course; strength depends on site and age.

Outlook

Long term

The rash usually improves after contact with the allergen stops, although recovery is not immediate. The allergy can persist for life, making future avoidance important.

Mild irritation can improve after exposure stops, but chronic hand dermatitis may take longer to recover. Continued protection is important because repeat exposure can restart the inflammation.