Post-inflammatory erythema, commonly shortened to PIE, is a term that was first introduced in dermatology literature in 2013 by Bae-Harboe et al. to describe erythema (redness of the skin or mucous membranes, caused by hyperemia (increased blood flow) in superficial capillaries), often seen after the resolution of inflammatory acne or other inflammatory skin conditions. After […]View post to subscribe to site newsletter.