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 benign, or non-cancerous, growths of skin caused by a virus. Unsupported extension