Medically reviewed by Jane Kim, MD You may have swollen armpit lumps due to infections, cysts, or vaccines.In severe cases, ...

Lipomas, benign fatty lumps beneath the skin, commonly affect adults aged 40-60, often appearing on the arms, back, or neck. Usually painless and slow-growing, they may cause discomfort if large.

Although these types of tumors commonly affect regular breast tissue, they are rarely found in extra, or "accessory," breasts. When you purchase through links on our site, we may earn an affiliate ...