What are the chances of a completely normal looking mole (with no concerning characteristics) being melanoma?

Can't say.: 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.