Could be : Lint from a sock, dried blood, fungus or melanoma. The last is dangerous. Check it with doc if unsure probability wise likely one of first three.
Answered 3/21/2015
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A doctor has provided 1 answer
A doctor has provided 1 answer
A doctor has provided 1 answer
2 doctors weighed in across 2 answers
A doctor has provided 1 answer
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