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Dr. Andrew Rynne
MD
Dr. Andrew Rynne

Family Physician

Exp 50 years

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What Causes A Lump Under The Left Arm Pit?

Hi i am a 14year old female....i had a bump on my left armpit for quite a while now, how long i cant remember. Todayi was rubbing my armpit and a black substance popped out of the bump....it looked like a mini raisin but with pit hair on it. As it popped out it left a hole/tunnel in my skin. Its quite disguting&im really worried
Fri, 26 Dec 2014
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General Surgeon,  's  Response
Hello!

Thank you for the query.

Most likely the lump is nothing more than a cyst caused by ingrown hair. The hair could be there for a long time growing constantly. As it has popped put, most likely nothing more needs to be done.
Please have it under observation. If the hole will slowly getting smaller, no need to do anything else. However if this wont be getting better, you should consult dermatologist.

Hope this will help.
Regards
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General & Family Physician,  Dr. Ramesh M.Vachharajani's  Response
Hi,
from history it seems that you might be having infected Epidermoid cyst producing this problem.
Consult surgon and get examined.
If he advice removal of cyst, go for it.
Ok and take care.
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What Causes A Lump Under The Left Arm Pit?

Hello! Thank you for the query. Most likely the lump is nothing more than a cyst caused by ingrown hair. The hair could be there for a long time growing constantly. As it has popped put, most likely nothing more needs to be done. Please have it under observation. If the hole will slowly getting smaller, no need to do anything else. However if this wont be getting better, you should consult dermatologist. Hope this will help. Regards