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.
To counteract the flaking, your epidermis, the main outer layer of skin, produces sebum. Sebum is a protein that repels water. However, when you are in the tub, scrubbing away the dead cells on your statum corneum, you also soak away some of the sebum. Thus your skin can't repel the water as before and so it swells up, especially in your toes and fingers.