What causes fungal acne? "Fungal acne is an infection of the hair follicles caused by Malassezia, a yeast," says New York City-based dermatologist Dr. Dhaval Bhanusali. Though the name may sound scary, rest assured — Malassezia is naturally occurring on everyone's skin. "This yeast is on all of our bodies naturally, however sometimes it overgrows when we sweat, leading to pityrosporum folliculitis and other conditions," explains Gohara.
Since sweat can cause overgrowth, fungal acne may be something you're acquainted with if you consider yourself a gym rat. "It's becoming more and more common, particularly among the workout crowd," says Bhanusali.
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