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.
According to the Skin Type Solutions blog : In simplest terms, sebum is just oil secreted by your skinâs sebaceous glands. Sebum is actually Latin for âfat,â which makes sense, and every square inch of your skinâwith the exception of the palms of your hands and the soles of your feetâhas it.ccording to the Skin Type Solutions blog : In simplest terms, sebum is just oil secreted by your skinâs sebaceous glands. Sebum is actually Latin for âfat,â which makes sense, and every square inch of your skinâwith the exception of the palms of your hands and the soles of your feetâhas it.