Likely a boil...: I suspect you have a boil under your arm (it is like a giant zit). Under the hair (hair follicle) an abscess/infection can form and as it enlarges, it causes that sore lump. It can be quite painful. I would recommend talking to your parents (as you are only 16?) about it so that they can call your doctor to have it checked out and treated. Good luck.
Answered 12/14/2013
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A doctor has provided 1 answer
A doctor has provided 1 answer
A doctor has provided 1 answer
A doctor has provided 1 answer
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