Moles

Melanoma is a life-threatening form of skin cancer. This cancer starts in the color-producing (pigment-producing) cells of the skin. Melanoma may develop from a previously existing mole (nevus) or may occur as a new lesion. Early diagnosis and treatment can lead to complete cure and survival, while advanced forms are likely to have a poor outcome (prognosis). Advanced melanoma can spread (metastasize) to the lymph nodes and other areas in the body, usually the lungs, liver, and brain.

The Mayo Clinic has prepared a series of slides showing a variety of skin conditions resulting from over-exposure to sunlight. The slides include examples of:

• Uneven pigmentation
• Solar lentigines

Moles are small skin marks caused by pigment-producing cells in the skin. They can be flat or raised, smooth or rough, and some contain hair. Moles are commonly about a half inch across or less.

Most moles are dark brown or black, but some are skin-colored or yellowish. They can change over time and often respond to hormonal changes.