Sweat itself isn’t the culprit behind acne, but trapped sweat mixed with sebum, dead skin, and friction can create breakouts, especially on the face, back, and chest. Heat, tight clothing, and poor barrier health can worsen the problem.
Prevention focuses on gentle cleansing, quick clothing changes, barrier repair, and using sweat-resistant, non-comedogenic products. Identifying the type of post-sweat bumps—acne, heat rash, or fungal acne—ensures proper treatment, while persistent or severe cases should be evaluated by a dermatologist.
https://www.drsu.in/blogs/derm-school/does-sweat-trigger-breakouts-here-s-what-science-says