Folliculitis is an infection of the follicles and is usually caused by the hair follicle being blocked or plugged by an ingrown hair or some sort of bacteria. This is usually caused by excessive shaving of an area or if the area is being rubbed constantly by some sort of clothing such as a hat or toque.
A common form of folliculitis is caused by the bacteria pseudomonas aeruginosa. Basically, it is just caused by prolonged exposure to hot tubs or pools that have not been properly cleaned. This is why we recommend that our hair transplant patients avoid swimming or exposure to hot tubs and pools for at least 2 weeks after a hair transplant procedure.
The bacteria that causes this type of folliculitis is most commonly found in hot tubs, especially those that are made with wood. However, it is also commonly found in swimming pools and public water parks.