A sebaceous cyst—also known as a steatocystoma—is a fluid-filled bump under your skin that ... such as your neck, scalp, ...

If you have itchy armpits ... breasts, groin area, and in other body creases, such as elbows and knees. Prickly heat causes ...

The most common signs of hidradenitis suppurativa are painful, pea-sized lumps under the skin ... and contain sweat glands, like the armpit, groin, genitals, breasts, and buttocks.

HS symptoms typically show up in areas where the skin rubs together like armpits, groin, inner thighs ... they can leave tunnels under the skin or form into hard lumps that grow and stick around ...