Over 3 million cases of folliculitis are reported each year in the United States. Folliculitis presents as infected hair follicles. Bacterial folliculitis occurs due to a presence of bacteria (usually staph) and inflamed cells within the ostia (opening) and the wall of a hair follicle that produces a follicular pustule. Hot tubs, or heated pools that are not pH-balanced, are the culprits for pseudomonas or hot tub folliculitis. Pityrosporum folliculitis occurs due to a yeast infection with pustules located on the back, chest, neck, shoulders, and upper arms. Over the counter products with benzoyl-peroxide can treat folliculitis. Eating foods that boost the immune system and improve skin health can help prevent folliculitis. Want to read more? Subscribe to one of our monthly plans to continue reading this article.