so the armpits are frequently affected. Hidradenitis suppurative (HS) is a chronic condition that causes painful bumps to develop under the skin. It occurs in areas with hair follicles and sweat ...

In the 10th grade, Selina Ferragamo noticed large, red bumps ... was painful to sit down sometimes, "it never got really bad," she said, until she noticed the same cysts forming under her armpits ...

Medically reviewed by Kashif J. Piracha, MD Armpit pain has many causes. Muscle strain and rashes are common minor conditions. Nerve compression and infections are more serious conditions. Swollen ...