Most people develop moles during childhood, and they fade gradually after middle age.
Unusual moles can be detected by followed the ABCD’s of abnormal moles:
A: Asymmetry: Visually divide the mole in half. Each side should look like the other side. If not, it is considered asymmetrical and may be a warning sign. It could also have evolved into a skin tag.
B: Border irregularity: Moles should have even, round, smooth borders. They should not be jagged or irregular.
C: Color: Moles should be uniform in color, as in all light brown or dark brown. Moles that are atypical often have combinations of coloring, most importantly black.
D: Diameter: Most abnormal moles are greater than the tip of a pencil eraser (about 6mm). However, this is not a hard and fast rule, so it is best to have your moles checked by a dermatologist.