Skin conditions

Let’s take a look at a few common skin conditions.

Moles are colored spots on the skin, formed by cells containing the dark pigment, melanin. While generally harmless, some moles can change shape and color, or start bleeding and require immediate evaluation.

Some birthmarks are simply moles that are present at birth, called a pigmented birthmark. Others result from the rapid growth of blood vessels in a localized area, called red birthmarks.

When a person becomes older, they may develop age spots. Age spots are patches of increased pigmentation on the skin’s surface, like freckles.

Warts are another very common type of skin disorder. Warts are benign, or non-cancerous, growths of skin caused by a virus.

Skin conditions

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Review Date: 11/20/2025

Reviewed By: Ramin Fathi, MD, FAAD, Director, Phoenix Surgical Dermatology Group, Phoenix, AZ. Also reviewed by David C. Dugdale, MD, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.

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