Hidradenitis suppurativa can affect one spot or multiple areas of the body. Signs and symptoms of hidradenitis suppurativa include: 1  Blackheads. Small pitted areas of skin containing blackheads â often appearing in pairs or a double-barreled pattern â are a common feature.  Red, tender bumps. These bumps often enlarge, break open and drain pus.
Sebum is an oily substance that's secreted by sebaceous glands to keep skin moisturized. Too much leads to oily skin and too little leads to dry skin. Sebum is an oily substance that's secreted by sebaceous glands to keep skin moisturized.
pertaining to or secreting sebum. 1  sebaceous cyst a benign retention cyst of a sebaceous gland containing the fatty secretion of the gland; this may occur anywhere on the body except the palms of the hands and soles of the feet, although such cysts are most common on the scalp, back, and scrotum.