It could be : Bacterial, viral (herpes zoster) or inflammatory. See your dr for any concerns. Take care!
Answered 12/10/2013
5.1k views
Many possibilities: Pressure on one area of the skin can do this, along with insect bites, etc. It would help to know where this occurred and under what circumstances. See a doctor and have them take a look at it. Cannot really diagnose without an exam.
Answered 6/2/2013
5.1k views
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