Melanoma It's uncommon, but cancer cells can grow under nails. Geogha says you can typically tell something's amiss if there are blue-black or brown discolored, asymmetrical lines showing up on your nail beds. Of course, there is no at-home treatment for melanoma. If you see this kind of asymmetrical discoloration under your nails, see your doctor immediately. "You'll likely need a biopsy," says Geogha.
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