A mole on skin is usually a common skin growth made of pigment-producing cells called melanocytes, and most moles are harmless. They can be flat or raised, and come in different colors, shapes, and sizes.

What it looks like

Moles may appear as small dark spots, flesh-colored bumps, or brown, tan, pink, or black marks. Some people are born with them, while others develop them later in childhood or adulthood.

Why they happen

Common reasons include genetics, sun exposure, and hormonal changes such as puberty or pregnancy. In plain terms, a mole is often just a cluster of skin cells growing together instead of spreading evenly.

When to get it checked

Watch for the ABCDE warning signs: asymmetry, irregular border, uneven color, larger diameter, or evolution/change over time. A new or changing mole, especially one that itches, bleeds, or crusts, should be checked by a dermatologist.

Quick note

Most moles are normal, but any mole that looks unusual or changes should be professionally evaluated. If you want, I can also give you a simple “normal mole vs suspicious mole” checklist.