If you experience any of these symptoms do not assume it is due to cancer. Most of these symptoms may be caused by other, less serious health conditions. If you experience any one of them, see your physician.

Melanomas are not usually painful. The first sign of melanoma is often a change in the size, shape, color, or feel of an existing mole. Melanomas also may appear as a new, black, or abnormal mole. Symptoms result from the uncontrolled growth of cancer cells.

It's important to remember that most people have moles, and almost all moles are benign.

The following are signs that a mole may be a melanoma:

Asymmetry – the shape of one half does not match the shape of the other half.

An Asymmetrical Mole

Skin Cancer Sign: Asymmetry in Mole
© 2009 Nucleus Medical Art, Inc.

Ragged edges – the edges are ragged, notched, blurred, or irregular, and the pigment may spread into surrounding skin.

A Mole with Ragged Edges

Skin Cancer Sign: Irregular Border on Mole
© 2009 Nucleus Medical Art, Inc.

Color variation – the color is uneven with shades of black, brown, or tan, and possibly even white, gray, pink, red, or blue.

A Mole with Color Variation

Skin Cancer Sign: Color Variation
© 2009 Nucleus Medical Art, Inc.

Change in size – the mole changes in size, usually growing larger, but also possible shrinking. Melanomas are usually larger than the eraser of a pencil (5 millimeters or 1/4 inch).

Change in texture – the mole may begin to have fine scales. In more advanced cases, a mole may become hard or lumpy.

Itching – the mole may start to itch. In more advanced cases, it may ooze or bleed. A mole that bleeds should always be brought to the attention of your doctor.