It can occur in people of all ages, including children. If detected in its early ages, before it has spread, it is almost 100 percent curable. The American Cancer Society. Any unusual change in the way an area of skin looks or feels may be a sign of skin cancer or a warning that it is likely to occur. Melanomas, on the other hand, tend to be asymmetric.
Early melanomas tend to have a notched, irregular or indistinct border.
Early melanomas tend to have an uneven color. The mole may exhibit differing shades of tan, brown, or black, sometimes with patches of red, white or blue. In addition to the ABC characteristics, most melanomas are wider than 6 millimeters, or about the size of a pencil eraser. The American Cancer Society.