Hair follicles are tiny sacs with hair-generating cells at the bottom. Folliculitis is an inflammation of one or more hair follicles. It is most often seen in the beard area (called ‘barber’s itch’), the arms, back, buttocks and legs. This is usually due to bacterial infection with Staph. However, viruses such as herpes zoster, and fungi, such as Microsporum, or yeast organisms like Malassezia, may also cause folliculitis.