Seek Immediate Attn: Without seeing the problem, have to worry first and foremost about cellulitis, AKA infection of the skin and subcutaneous portion thereof. If this so, then prompt prescription of appropriate antibiotic would be necessary. Other lesser differentials are some form of bite or skin reaction that your arm came in contact with. But again, this area should be examined by a doctor immediately.
Answered 6/9/2014
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