Folliculitis. Close-up of red skin papules caused by an infection of hair follicles. Folliculitis occurs when bacteria (usually Staphylococcus) proliferate under the skin around a hair follicle, resulting in tender, pus-filled inflammations. The condition can occur anywhere on the body and may spread outwards in a ring, causing permanent loss of hair. Treatment includes frequent washing, strict hygiene and antibiotic drugs.