Why Redness (PIE) Can Linger for Months on Tretinoin — and What Actually Helps It Fade
Four months into tretinoin and still seeing pink or red patches where breakouts used to be? That lingering redness is frustrating, especially once the actual acne has calmed down — but it’s a well-documented part of how skin heals, and it usually isn’t a sign that anything is wrong. PIE vs. PIH: two different kinds […]