Medical Attention: Most lumps are harmless and are usually the result of abnormal tissue growth. An armpit lump may feel small. In other cases, it may be extremely noticeable. Armpit lumps may be caused by cysts, infection, or irritation due to shaving or antiperspirant use. However, these lumps may also indicate a serious underlying health condition. Seek medical attention.
Answered 7/28/2019
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