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 glands produce sebum, an oily substance comprised of triglycerides, wax, squalene, and free fatty acids. Sebum keeps the skin and hair moisturized and acts as a waterproofing barrier to prevent them from becoming dry and brittle. It also performs an important function by inhibiting the very growth of microorganisms on the skin. The Association Between Sebum and Acne