Boils develop when hair follicles or sweat glands become infected, leading to painful, pus-filled bumps beneath the skin. The warm, moist environment of the armpit creates ideal conditions for ...

They present as painful pus-filled pockets, which form under the ... the infections. A boil starts as a red, painful bump and is usually found in the buttocks, face, neck, armpits and groin.

While it was painful to sit down sometimes, "it never got really bad," she said, until she noticed the same cysts forming under her armpits years ... cystic acne or boils, it can be difficult ...