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Diameter is width. If the diameter across a mole or skin growth is larger than 1/4 inch (6 mm), or about the size of a pencil eraser, talk to your doctor. Also, call your doctor if any mole seems to be growing, even if it is still smaller than 1/4 inch (6 mm).
Primary Medical ReviewerKathleen Romito, MD - Family Medicine
Specialist Medical ReviewerAmy McMichael, MD - Dermatology
Current as ofNovember 20, 2015