Hot tub folliculitis is an infection of the skin around the lower part of the hair shaft (hair follicles). It occurs when you come into contact with certain bacteria that live in warm and wet areas.
Folliculitis can occur in a hot tub and is most likely due to an opportunistic bacterial infection of the skin or hair folical. Often a bacteria can survive in warm water, even when adequately sanitized with either bromine or chlorine. Often it’s doesn’t show up as a green hue in the water because it may be a biofilm in the water or within the piping system. Contamination is more common if the water is inadequately treated. Hot tub folliculitis is an eruption of scattered small red itchy or tender bumps, some of which are pustular. They mainly occur in areas that are covered by your swimsuit, like the waistband of the suit where the water stays in contact with your skin for a longer period of time.
Treatment may not be needed. The mild form of the disease often clears on its own. Anti-itch medicines may be used to ease discomfort. In severe cases, your health care provider may prescribe an antibiotic.
Ensuring that you have adequate sanitizer (bromine or chlorine) in the tub BEFORE you enter is important.
Also it is important to control the acid levels in your tub (alkalinity and pH)