How do you know if you have a cancerous mole?

See a doctor: See a doctor to have the mole looked at. If they are concerned, they will biopsy or send you to a dermatologist to look at. The only way to know if it is cancerous or not is to biopsy and send to a lab for microscopic evaluation.

By biopsy: AAD Malignant Melanoma screening: ASYMMETRY: 1 half is unlike the other. BORDER: irregular, scalloped or poorly defined. COLOR: varied with shades of tan, brown or black; or white, red or blue. DIAMETER: > 6 mm. EVOLVING: mole /skin lesion looks different from the rest or is changing in size, shape or color. An irregular mole that itches, bleeds or is painful is worrisome for possible cancer.