A lipoma is a lump under the skin that occurs due to an overgrowth ... trunk, neck, thighs, and armpits. In less common cases, they may form in internal organs, bones, or muscles.

Jessica Butler, 29, was diagnosed with hidradenitis suppurativa (HS), a chronic disease that causes boil-like lumps to form under ... her breasts, armpit, groin, and thighs. The bumps were ...