toggle mobile menu Menu
toggle search menu

Site Navigation

Supplemental

Menu

Melanoma skin cancer sign: Diameter

A mole, showing its width compared to a pencil eraser

Melanoma is the most serious type of skin cancer. The most important warning sign of melanoma is a change in the size, shape, or color of a mole or other skin growth, such as a birthmark.

  • A change in diameter (width) is one thing to watch for. Call your doctor if:
    • The width of a mole or skin growth is larger than 1/4 inch (6 mm), or about the size of a pencil eraser.
    • Any mole seems to be growing, even if it is still smaller than 1/4 inch (6 mm).

Current as ofDecember 19, 2018

Author: Healthwise Staff
Kathleen Romito, MD - Family Medicine
Adam Husney, MD - Family Medicine
Amy McMichael, MD - Dermatology

This information does not replace the advice of a doctor. Healthwise, Incorporated disclaims any warranty or liability for your use of this information. Your use of this information means that you agree to the Terms of Use. Healthwise is a URAC accredited health web site content provider. Privacy Policy. How this information was developed to help you make better health decisions.

© 1995-2015 Healthwise, Incorporated. Healthwise, Healthwise for every health decision, and the Healthwise logo are trademarks of Healthwise, Incorporated.