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Anonymous
I get those from time to time too, although in my case, I'm sure it's due to the use of copious amounts of antiperspirant.
It's probably a swollen lymph node, and it can be harmless like in my case, in which I just cut back until it goes away, or it can be the sign of an infection or something.
They go away after a few days, but you should pay attention to what you're doing to your armpit. If it's not irritation caused by antiperspirant or shaving it or something else you're doing to the skin, it might be a sign of an infection.
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