Folliculitis: An infection or inflammation of the hair follicles of the skin. Inflammation of the hair follicles can occur when the skin is disrupted or inflamed due to a number of conditions, including acne, or injuries, friction from clothing, excessive sweating, or exposure to toxins. The symptoms vary and include small, red bumps or blisters around hair follicles, blisters filled with pus, or itching and tenderness of the involved area. When the deeper parts of the hair follicle are involved a painful lump or mass may be felt.
"Hot tub folliculitis" refers to a folliculitis arising from infection with Pseudomonas bacteria which can be present in hot tubs where the acidity and chlorine levels are not well controlled.