Moles
Moles are ordinary clusters of pigment cells in the skin, and almost all of them stay harmless for a whole lifetime. What matters is not how many you have, but whether one of them is changing - because a changing mole is the earliest sign of melanoma, and the earliest melanoma is the one that is easiest to cure.
Key facts
Moles at a glance.
Typical signs
Pigmented spots or raised bumps
Common locations
Anywhere
Expected course
Usually stable; watch for changes
Treatment options
Usually observation
What is it?
Top things to know about Moles
- They are clusters of pigment cells. Moles are usually benign collections of melanocytes.
- They vary in appearance. They can be flat or raised, skin-colored or pigmented.
- They appear at different times. Some are present at birth; others appear later.
- New or changing moles need a check. A stable familiar mole differs from an evolving lesion.
What it looks like
What Moles looks like
Moles are clusters of pigment cells. Most are round or oval, smaller than a pencil eraser, with smooth edges and an even brown, tan or skin color. They can be flat or raised, and may have hair. Most adults have 10 to 40 moles. New moles usually appear during childhood and early adulthood. A mole that changes in size, shape or color, or looks different from the rest, should be checked.
Moles are grouped by when they appear and how they look.
Common mole
Small, round, even color.
Atypical mole
Larger, uneven border or color.
Congenital mole
Present from birth.
Halo nevus
Generated illustration. Mole surrounded by a pale ring.
Blue nevus
Small blue-gray mole.
Where it shows up
Location varies
Moles can occur at many sites. A fixed shaded pattern would not be useful for identifying a changing lesion.
On different skin tones
Moles on different skin tones
Moles occur on all skin tones. On lighter skin, they look tan to brown. On brown and Black skin, they are usually darker brown or black, and moles on the palms, soles and nails deserve extra attention since melanoma in darker skin most often appears there.
What happens in Moles?
Moles form when benign pigment cells cluster into small nests. The location and arrangement of these cells help explain why some moles are flat and others are raised.
- A spot or bump is visible: Many moles are flat, while others are raised.
- Pigment cells cluster: Nevus cells form small organized nests.
- Some nests sit in the dermis: Different mole types have different arrangements.
Causes and triggers
What causes Moles
Causes
Why it happens
Moles form when pigment cells grow in a cluster instead of spreading through the skin. Most appear in childhood and early adulthood.
The number of moles you have is largely inherited.
Risk factors
Raise the odds
- Fair skin
- Family history of many moles
- Childhood sunburns
Triggers
Bring it on or make it worse
- Sun exposure in childhood (Strong link)
- Pregnancy (Possible)
When it usually starts
When it usually starts
Moles
Most ordinary moles appear during childhood and adolescence; new or changing adult lesions deserve attention.
Daily care
Daily care for Moles
Learn the ABCDE signs
Asymmetry, Border, Color, Diameter, Evolving — the one that matters most.
Learn the ugly duckling sign
The mole that does not belong in the family.
Check your own skin about once a month
Include back, scalp, soles, palms and nails.
Take photographs
Comparison over months beats memory.
Use sunscreen daily on exposed skin
Broad spectrum, SPF 30 or higher, reapplied outdoors.
Use shade, clothing and hats
A long-sleeved shirt outperforms any bottle.
Never use a tanning bed
No protective base tan, no safe dose.
Protect children from burning
Risk is largely set before adulthood.
Discuss skin surveillance if your immune system is weakened
Immune-suppressing treatment raises skin cancer risk.
Avoid: Sunburn
Raises mole count and damages the cells inside.
Avoid: Tanning beds
A concentrated dose of the damaging wavelengths.
Avoid: Intense occasional sun
Holiday exposure matters more than steady daily sun.
Avoid: Skipping sunscreen in cloud and winter
Ultraviolet passes cloud and reflects off snow.
Avoid: Assuming a painless mole is fine
Pain and itch are late signs.
Avoid: Only checking the parts you can see easily
Scalp, back, buttocks, soles and nails all count.
Avoid: Relying on a phone app
A reassuring result is no reason to cancel.
Avoid: Being told once that a mole is fine
A mole examined five years ago was fine five years ago.
Avoid: A mole-checking phone app
Use photos to track changes; never delay an examination because an app gives reassurance.
Avoid: Mole removal creams and kits
Do not burn, freeze or dissolve moles at home; the tissue may need examination.
Avoid: Waiting to see if a change settles down
Three months of waiting is three months of growth.
Avoid: Cryotherapy
Freezing is excellent for several other skin growths and is the wrong tool for a mole. It destroys the tissue, so nothing can be examined, and it commonly leaves the deeper pigment cells behind along with a pale mark. Lasering or burning a mole off has the same two problems. If a mole is worth removing, it is worth removing in a way that can be checked.
Treatments
Treatments for Moles
Excision
The standard for any mole that is genuinely in doubt: the whole mole is cut out under local anesthetic with a narrow margin of normal skin and sent for examination under a microscope. Taking all of it matters, because the pathologist has to see the full depth and the edges. It leaves a line scar, and results come back in a week or two.
Shave Removal
A raised mole that catches on a razor or a collar can be shaved off flush with the skin under local anesthetic, leaving a flat pale mark rather than a line scar. It is a reasonable choice for a mole that is not suspicious, and the tissue still goes to the laboratory. Two honest limits: pigment left at the base can grow back, and a shave through a melanoma cuts across it rather than under it.
Punch Biopsy
A small circular blade removes a small mole whole, down through the full thickness of the skin, and it is closed with a stitch or two. It suits moles smaller than the punch. Used to take a sample from part of a larger suspicious mole it can under-read the depth, so for those an excision is the better choice.
Outlook
What to expect with Moles
Moles have a life cycle, and knowing the normal version makes the abnormal easier to spot. Three things are out of step with it — a mole that changes after it should have stopped, a new pigmented spot in an adult over 40, and a mole unlike all your others. None mean melanoma; all mean an in-person look.
- 1
Congenital · Birth to age 2
Most are small and grow with the child.
- 2
Appearing · Ages 2 to 20
New ones keep arriving through childhood and the teens; existing ones grow slowly with the child.
- 3
Settling · Ages 20 to 40
Moles may lift off the surface or lose color. Pregnancy can darken them; one that changes shape still needs looking at.
- 4
Stable · Ages 40 to 60
Existing ones soften and pale. Waxy, stuck-on seborrheic keratoses appear and get mistaken for new moles.
- 5
Fading · Age 60 onward
Against that background a new or changing spot stands out more, and matters more.
Complications
Complications
- Associated concerns
Most moles are benign. Having many or atypical moles can mark increased melanoma risk, and a changing lesion should be examined rather than assumed to be an ordinary mole.
When to get help
When to get help
When to seek care
Arrange prompt assessment for an evolving, unusual or bleeding mole. Comparing a spot with your other moles is useful, but photographs cannot confirm a diagnosis.
Lookalikes
What else could it be?
Seborrheic Keratosis
Seborrheic keratoses often look waxy or stuck on and appear later in life. Moles are usually smoother and often date from childhood or the teens.
Sun Spots
Sun spots usually appear in groups on sun-exposed areas over time. Moles often appear earlier in life and are more round and evenly colored.
Basal Cell Carcinoma
A pigmented basal cell cancer may keep growing, look shiny, or repeatedly scab and reopen. A changing or non-healing bump needs examination.
Questions
Questions you might be asking.
How do I tell a normal mole from a dangerous one?
Use two checks together. ABCDE covers asymmetry, an uneven border, more than one color, a diameter above about 6 millimeters, and - most important - evolving, meaning changing. The ugly duckling check asks whether the mole looks like your others. A spot that fails either, or passes both but keeps changing, should be examined in person.
Is it normal to get new moles as an adult?
New moles keep appearing through the teens and twenties and become uncommon after about 40. Many new pigmented spots in older adults turn out to be seborrheic keratoses or sun spots. That is a reason to have a new spot identified, not to assume it is one of those.
Can I have a mole removed just because I do not like it?
Yes, and it is a reasonable request. What matters is how it is done — cut out under local anesthetic and sent to a laboratory. Lasering, freezing or burning leaves nothing to examine, so ask for the version that gets checked.
Does having a lot of moles mean I will get melanoma?
No. Your risk is higher than average and regular checks are worth doing, but most people with a high mole count never develop melanoma. The response is a schedule of skin exams, not worry.
Can melanoma appear where there was no mole?
Yes — most melanomas arise on skin that had no mole before. That is why a new spot that grows, or a sore that will not heal, deserves the same attention as a changing mole.
My mole changed during pregnancy. Is that expected?
Moles commonly darken slightly in pregnancy, and skin stretching over a growing abdomen or breasts can change a mole's shape. Melanoma does occur in pregnancy, though. A mole that changes in shape, border or color should be looked at while you are pregnant, not after.
Sources
Sources and further reading
Related
Keep exploring.
Shave Removal
Basal Cell Carcinoma
Seborrheic Keratosis
Sun Spots
Punch Biopsy
Surgical Excision
Moles vs Seborrheic Keratosis
Sun Spots vs Moles
Skin Tags vs Moles
Moles vs Melanoma
Dermatofibroma vs Moles
