Many possibilities: Without seeing this 'small bump' impossible to tell what it may be. See the doctor who first did the swab of the initial sore. This should be looked into, just to make sure is nothing serious, although probably is benign.
Answered 2/10/2013
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A doctor has provided 1 answer
4 doctors weighed in across 2 answers
A doctor has provided 1 answer
5 doctors weighed in across 2 answers
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