Doctor can examine: Lumps in the armpit of an adult can be due to ingrown hairs or blocked oil (sebaceous) glands. Occasionally, they are blocked pores, filling up with dead skin cells. If a lump hurts, it may be infected and would need antibiotics or be opened by a doctor, depending on how it looks. Lumps deeper in the armpit may be enlarged lymph nodes, which can be infection of some kind, or more rarely cancer.
Answered 5/17/2020
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