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.
Properties of Human Body Oil. Human skin secretes a natural oil, known as sebum, to protect and lubricate the skin and hair. According to a 2001 report from pharmacy researchers at Rutgerâs University, âHuman sebum is a mixture of triglycerides, fatty acids, wax esters, sqalene, cholesterol and cholesterol esters.â.