Melanoma is a kind of skin cancer. It isn't as common as other types of skin cancer, but it is the most serious.
Melanoma usually looks like a flat mole with uneven edges and a shape that is not the same on both sides. It may be black, brown, or more than one color. Most melanomas show up as a new spot or skin growth. But they can form in an existing mole or other mark on the skin.
Melanoma can affect your skin only, or it may spread to your organs and bones. As with other cancers, treatment for melanoma works best when the cancer is found early.
This topic is about melanoma that occurs in the skin. It doesn't cover melanoma that occurs in the eye or in any other part of the body besides the skin.
You can get melanoma by spending too much time in the sun. Too much UV radiation from sun exposure causes normal skin cells to become abnormal. These abnormal cells quickly grow out of control and attack the tissues around them.
You are at higher risk for melanoma if you have fair skin, a family history of melanoma, or many abnormal, or atypical, moles. These moles may fade into the skin and have a flat part that is level with the skin. They may be smooth or slightly scaly, or they may look rough and "pebbly."
You may not have any symptoms in the early stages of melanoma. Or a melanoma may be sore, or it may itch or bleed.
Any change in the shape, size camera.gif, or color camera.gif of a mole may be a sign of melanoma.
Melanoma may look like a flat, brown or black mole that has uneven edges camera.gif. Melanomas usually have an irregular or asymmetrical shape. This means that one half of the mole doesn't match the other half. They may be any size but are usually 0.25 in. (6 mm) or larger.
Melanomas can be found anywhere on your body. Most of the time, they are on the upper back in men and women and on the legs of women.