Skin lesions that are asymmetrical, have irregular borders or color variations, or are larger than 6 millimeters in diameter should be checked immediately by a dermatologist. Nodular melanoma does not follow the ABCD rule and is difficult to catch early, so dermatology and epidemiology professor Martin Weinstock wants to add EFG to the cancer detection alphabet. Lesions that are elevated, firm and growing ­could be nodular melanoma and also should be checked, according to a study published in Archives of Dermatology.

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