What is hidradenitis suppurativa (HS)? Hidradenitis suppurativa (HS) is a chronic skin disease. It causes painful, boil-like lumps that form under the skin. It often affects areas where the skin rubs together, such as your armpits and groin. The lumps become inflamed and painful. They often break open, causing abscesses that drain fluid and pus. As the […]
