Sebacious Cyst: Sebacious cysts can behave like this. Seek evaluation when it is in painful state. A condition called hidradenitis supporative can exist in the arm pits. It is sometimes exacerbated by the use of antiperspirants. The powdery character of these clogs ducts in the arm pit, and inflammation and infection can ensue. Warm moist compresses can sometimes help, as well as sticking to deodorants alone.
Answered 4/16/2014
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