10 Symptoms of Melanoma
Reviewed: Dr. Gromatzky
Symptom #4: Diameter
Normal and healthy moles are usually flat, small, symmetrical, round, and only have one shade of brown, black or tan color in appearance. One of the factors that might signify that the mole is affected is the diameter of the lesion.
While it is not an absolute rule, spots that are larger than 6 millimeters (1/4 inch or the size of a pencil eraser) in diameter may indicate that it is a melanoma. This is due to the reason that benign moles tend to have a smaller diameter compared to malignant lesions. If you notice that you have a darker spot that is growing or increasing in size, you should seek medical attention.
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