Some of the common causes of armpit lump are viral,bacterial or fungal infections leading to swelling of the lymph nodes. Antiperspirant usage,shaving underarms,allergic reaction to any drug also causes these lumps.
If this lump is not painful,not increasing in size and any discharge is not there it is likely that it may be some viral infection and may resolve by itself in few days.
You can visit your regular MD to get it examined.
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