pie-vs-pih
PIE vs PIH: How to Fade Post-Acne Redness and Brown Marks Faster After finally conquering active acne, the frustrating marks left behind can persist for months or even years, affecting confidence and requiring constant concealer coverage. Understanding whether your marks represent PIE (post-inflammatory erythema) or PIH (post-inflammatory hyperpigmentation) fundamentally changes your treatment approach and dramatically […]