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.
The sebaceous gland is a microscopic gland found in a personâs skin. In fact, the skin contains many of these glands, which produce and secrete sebum. Sebum is a yellowish, waxy substance that has an oily feel to it. It helps keep a personâs skin and hair from becoming too dry. Sebaceous glands are attached to the bottom of hair follicles in the skin. Cells within the sebaceous gland have the job of producing sebum. In time, these special cells burst, releasing the sebum to travel through the hair follicle shaft or duct and onto the surface of the skin or scalp.