What exactly is a melanoma?

Cancer of skin: Melanoma is the worst form of the three common type of skin cancers. These arise due to genetic susceptibility and sun exposure. Generally the lesions are pigmented, but not always. If a mole changes color, becomes bigger, or bleeds it should be checked out. For more info go to this site. Asap.http://www.ncbi.nlm.nih.gov/pubmedhealth/pmh0001853/.

Skin cancer : Melanoma is a skin cancer that starts in the pigmented cells or melanocytes of the outer skin layer. It is generally considered the most dangerous skin cancer because it is more likely to spread to internal organs (in a minority of cases) than other, more common, skin cancers like basal cell and squamous cell carcinomas.

Cancer of melanocyte: Melanoma is cancer of melanocytes. Melanocytes are cells that produce the dark pigment, melanin, which is responsible for the color of skin. These cells predominantly occur in skin, but are also found in other parts of the body, including the bowel and the eye (see uveal melanoma). Melanoma can originate in any part of the body that contains melanocytes.