Does chlorine cause acne? Swimming and skin

Chlorine is not listed as a cause of acne by the American Academy of Dermatology, which says acne develops when pores become clogged, and that hormones called androgens increase the size of the skin's oil glands so they make more oil. No source read for this guide names pool water as a cause. Swimming can still dry or irritate skin, which is a separate problem from acne.

Chlorine is not an acne treatment, and no guideline read for this guide recommends it as one. A 2022 study in Experimental Dermatology makes the point directly: despite regular immersion in antimicrobial chlorine, adolescent swimmers suffer from acne and tend to be resistant to standard therapies. Acne responds to acne medicines, and pool water is not one of them.

No evidence read for this guide shows chlorine clearing acne. The 2022 Experimental Dermatology swimmer study measured Cutibacterium acnes on swimmers' faces and found fluorescence levels dropped after an hour of swimming, yet the relative abundance of that bacterium was unchanged. Swimmers in that study still had acne. Killing surface bacteria for an hour does not treat what causes acne inside the pore.

Bumps after swimming are not always acne. The American Academy of Dermatology says you get folliculitis when you damage your hair follicles, and once damaged it is easy for germs to get inside. It describes hot tub folliculitis, where acne-like breakouts tend to appear on skin that was covered by your bathing suit, usually 12 to 48 hours after use. That pattern points away from acne.

Swimmer acne is the name a 2022 Experimental Dermatology paper used for acne in swimmers that resists usual treatment. The researchers studied 16 adolescent swimmers, 7 of whom had facial acne, before and after an hour of swimming. They found Pseudomonadaceae bacteria increased after swimming. The authors concluded this shift could potentially be associated with acne in swimmers, which is a possible link rather than a proven cause.

Back bumps after swimming are often folliculitis rather than acne. The American Academy of Dermatology says hot tub folliculitis produces acne-like breakouts on skin that was covered by a bathing suit, and lists tight clothing among the causes of folliculitis generally. A wet swimsuit held against the back matches both of those causes. A dermatologist can confirm which condition you have.

Pool water can dry and irritate skin, and irritated skin is harder to treat acne on. The American Academy of Dermatology's acne advice is to use gentle skin care and avoid things that dry the skin, including astringents, toners and exfoliants. If swimming leaves your skin tight and sore, the drying is the problem to address, and acne treatment still works on its own schedule.

Rinsing after a swim is sensible, and the American Academy of Dermatology already advises washing the face after sweating. Its acne guidance is to gently wash your face up to twice daily and after sweating, with a gentle non-abrasive cleanser applied with your fingertips. Changing out of a wet swimsuit promptly also removes the damp covered skin where hot tub folliculitis appears.

Sunscreen is advised, and the American Academy of Dermatology says to choose one labeled non-comedogenic or that says it will not clog pores. For acne gels, Skinli's guidance is to apply them at home rather than before a swim, since pool water and towel drying remove product and add irritation. The adapalene label says acne medicines raise the chance of sore, red or dry skin.

No source read for this guide links chlorine to fungal acne. Fungal acne involves yeast in the hair follicles and is a separate condition from acne, which the American Academy of Dermatology describes as clogged pores with oil and hormones involved. Bumps that itch, look uniform in size and sit on the chest, back or shoulders are worth showing to a dermatologist for a diagnosis.

Timing and location are the clues. The American Academy of Dermatology says hot tub folliculitis appears 12 to 48 hours after use, on skin that was covered by your bathing suit, and that a folliculitis spot may have a red ring around it, which is a sign of the infection. Acne follows its own pattern and appears in places a swimsuit never covered.

See a doctor when bumps keep returning, hurt, or do not fit acne. The American Academy of Dermatology says it can be helpful to see a dermatologist to make sure you have folliculitis, because infected hair follicles can look like another skin condition such as acne. Painful lumps under the skin, spots that leave scars, and acne that keeps worsening also need a doctor.