Melanomas can resemble or even develop from moles. Moles are brown spots or growths on the skin and are usually harmless, but not always. It is extremely important to check your skin frequently and look for the ABCDE warnings of melanoma:
Asymmetry – if the mole is irregularly shaped or the two halves of the mole do not match;
Border – if the edges of the mole are uneven, scalloped or notched;
Color – if the mole is a variety of colors or different shades of brown, tan or black;
Diameter – if the mole is larger in diameter than a pencil eraser (1/4 inch or 6 mm);
Evolving – if the mole changes in any way (size, shape, color) or begins to bleed, itch or form a crust.