What should you know about folliculitis hot tub rash?

Warm, wet water can allow bacteria to multiply, and prolonged contact may let them affect hair follicles. Red, itchy, tender, or pus-filled bumps may appear beneath swimwear or on areas that stayed covered. The rash can resemble acne, heat irritation, or [Skin Bumps](/symptoms/skin-bumps/), so the exposure history helps a clinician interpret it.

Symptoms may begin after using a hot tub, spa pool, or poorly maintained pool, but not every post-swimming rash is infectious. Friction from swimwear, shaving, sweat, or a product can also inflame follicles.

Shower with fresh water after swimming, change out of wet swimwear promptly, and wash clothing and towels before reuse. Keep the area dry, avoid shaving and picking, and do not share towels. Avoid the suspected pool or hot tub until it has been checked and the rash has settled.

A mild episode may improve with supportive care, but a clinician can decide whether testing or treatment is needed. If bacterial infection is suspected, options may include [Topical Antibiotic Therapy](/treatments/medical-dermatology/topical-antibiotic-therapy/) or [Antibiotics For Skin Infection](/treatments/medical-dermatology/antibiotic-therapy-for-skin-infection/).

Arrange care if the rash is spreading, increasingly painful, repeatedly draining, or not settling after you stop the exposure. Seek prompt help for fever, chills, marked swelling, severe illness, or redness extending away from the original area. People with reduced immunity should seek advice early.

Does the pattern fit hot-tub folliculitis or another swimming-related rash? Should I avoid the pool until it is checked? Do I need a prescription or a sample from a pustule? What should I do if the rash returns after swimming?