Lump under armpit

My sister noticed a small lump under her armpit several months ago. She had her doc look at it, she felt it and said its a cyst. That was that. Now last night, it started becoming painful, and she felt it and she said it was larger. Its under her skin inside. Anyone ever have this? Shes nervous its cancer, but I read cancer lumps under the armpit are typically painless. She is calling a dermatologist in the morning to have it either looked at or biopsied. Any experience with this?

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TexChik · F

The armpit area (axilla) is where a lot of lymph nodes are. Cysts are fairly common any where in the body. They are fluid filled sacks. A malignancy would begin to calcify and would feel hard like a rock and would be irregularly shaped. Cysts are round and squeezable. A needle aspiration (draining it) would give her relief, but if it needs to be removed likely the dermatologist is going to refer her to a surgeon or a plastic surgeon because of the area in which her cyst is located.