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The Vest Is the Occlusion. The Back Is Collecting the Minutes.

Skin Conditions · Published 2026-09-19 · 10 min read · 2249 words

Heat, polyester and a ride home in the same shirt is how trunks collect acne and then PIH. Rinse, change, short-contact wash, SPF the shoulders.

Key takeaways

Change the shirt before the commute.
Short-contact benzoyl peroxide beats a nightly net sponge.
Shoulder sun after training is a pigment appointment.
Deep cysts and keloids are a clinician, not a scrub.

Source: Isaacs et al. IJD 2025 / truncal acne and malassezia folliculitis literature / SA climate briefings (https://pmc.ncbi.nlm.nih.gov/articles/PMC12712754/)

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