Melanoma is a type of skin cancer that occurs in the cells of the outer skin layer that produce pigment (melanin). Most melanomas grow from moles on the surface of the skin, and symptoms of melanoma include changes or new moles that develop suddenly and look different from the usual moles that you have. Consider this information from the American Cancer Society and the Mayo Clinic about the symptoms of melanoma.
Asymmetry
A mole on your skin which does not have matching sides is a symptom of melanoma as well as other types of skin cancers.
Irregular Border
Moles on your skin that have irregular borders, such as ragged or bumpy sides and blurry edges, are a sign of melanoma.
Colorful
Melanoma skin cancers may contain several colors, including shades of brown, red, purple, blue and black; melanomas rarely match your skin tone.
Large Size
Skin cancers such as melanoma are usually at least a quarter inch in diameter and may grow larger in a short period of time.
New Growths
New growths that appear on your skin, especially new moles that do not match your other moles, are a symptom of melanoma.
Changing Moles
Moles or small patches of your skin that change, especially in shape or color, are a symptom of melanoma that requires prompt medical evaluation.
Slow Healing
A sore on that heals slowly or gets worse may actually be melanoma, and requires evaluation by a dermatologist or general physician.
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