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.
In healthy skin, the pore is open and the sebum comes out on the skin surface. In skin affected by acne, the opening of the pore gets clogged with dead skin cells. This blocks the sebum inside the follicle.Imagine a balloon that is getting filled. Similarly the follicle gets inflated as more sebum fills it.n healthy skin, the pore is open and the sebum comes out on the skin surface. In skin affected by acne, the opening of the pore gets clogged with dead skin cells. This blocks the sebum inside the follicle.