Apply at night, your skin repairs while you sleep.” It is the most repeated line in body care, and it is only half right. The circadian evidence tells a more precise, more useful story about when a resurfacing acid belongs on the body.
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The most common fear about acids is that they wear the skin away. On the body, the evidence points the other way: what thins is the dead build-up on top, while the living skin beneath grows measurably thicker.
More acid is not more progress. There's a point where exfoliation stops renewing skin and starts wearing it down, and the skin has a clear way of telling you that you've reached it.
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The instinct is to scrub. The follicle disagrees. A closer look at why physical exfoliation deepens the rough texture of keratosis pilaris, and what the follicle actually responds to.