MyChart
Melanoma skin cancer sign: Diameter
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.
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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 of: February 27, 2023
Author: Healthwise Staff
Clinical Review Board
All Healthwise education is reviewed by a team that includes physicians, nurses, advanced practitioners, registered dieticians, and other healthcare professionals.
