Here is what a melanoma looks like:
asymmetry – the shape of one half does not match the other.
Border – the edges are often ragged, notched, blurred, or irregular in outline; the pigment may spread into the surrounding skin.
Color – the color is uneven. Shades of black, brown, and tan may be present. Areas of white, grey, red, pink, or blue also may be seen.
Diameter—there is a change in size, usually an increase. Melanomas are usually larger than the eraser of a pencil (1/4 inch or 5 millimeters).
Watch for changes in a mole
melanomas in an early stage may be found when an existing mole changes slightly, for example, when a new black area forms. Newly formed fine scales and itching in a mole also are common symptoms of early melanoma. In more advanced melanoma, the texture of the mole may change. For example, it may become hard or lumpy. Melanomas may feel different from regular moles. More advanced tumors may itch, ooze, or bleed. But melanomas usually do not cause pain.
Hope this has helped!