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Hard lump in upper arm

I am 49 and am overweight. I have a very hard lump (can't really decide what to call it) in the very top of my left arm. It is sort of on the back side but is very close to my underarm. It is really hard and round. Just wondering about that area. Any ideas, opinions, experiences or inputs will be appreciated. Thanks!
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Avatar universal
I have found a good size knot in my upper arm. It is almost in the armpit but toward the back of my arm. It is very hard and about the size of a marble. I'm just a little concerned because of all the stuff located in the area. Any ideas, advice or experiences appreciated.thanks for taking the time.to read about my "maybe" problem.
1340994 tn?1374197577
Possibilities include lipoma or sebaceous cyst; both of these are benign and not a big problem.  Since it is near your armpit, having a doctor check it just to be certain is a good idea.  
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