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 cysts contain oil from the sebaceous glands surrounding the base of normal hairs. They contain a clear, oily liquid, have a pungent smell and can appear anywhere on your body except for your palms or soles of your feet. On your skin, sebaceous cysts may show redness and soreness, indicating a minor infection.