When melanocytes become cancerous, they are called melanomas. It is important to examine your moles regularly to look for any suspicious changes. Get someone else to inspect your scalp and other areas that are hard to see. Watch for the early warning signs of melanoma by using the ABCDE criteria:
Color variation (different colors within the same mole)
Diameter greater than 6 millimeters (larger than a pencil eraser)
Evolving (a new mole developing)
Practice safe sunning. Never sunbathe or visit a suntan parlor for the sake of tanning. Use high-SPF sunscreen when outdoors, wear protective hats and clothing, and avoid the outdoors when the sun is most intense, from 11 a.m. to 3 p.m. Sweating or swimming can cause sunscreen to wash off, even if it is labeled as "waterproof". Reapply sunscreen often.