{"title":"Post-Inflammatory Erythema","entity_type":"Concern","slug":"post-inflammatory-erythema","canonical_url":"https://skinknowledgebase.com/concerns/post-inflammatory-erythema","dates":{"date_modified":"2026-05-26","date_reviewed":"2026-05-26"},"mcp_eligible":true,"summary":"Post-inflammatory erythema is the pink or red-looking mark that can linger after acne, especially after inflammation or picking. Routine choices should stay","evidence_sources":[{"title":"AAD — How to fade dark spots in darker skin tones","canonical_citation_url":"https://skinknowledgebase.com/sources/aad-fade-dark-spots-darker-skin-tones","original_source_url":"https://www.aad.org/public/everyday-care/skin-care-secrets/routine/fade-dark-spots","source_type":"other"},{"title":"DermNet — Postinflammatory hyperpigmentation","canonical_citation_url":"https://skinknowledgebase.com/sources/dermnet-postinflammatory-hyperpigmentation","original_source_url":"https://dermnetnz.org/topics/postinflammatory-hyperpigmentation","source_type":"medical_reference"}],"product_fact_sources":[],"related_entities":[{"title":"AAD — How to fade dark spots in darker skin tones","url":"https://skinknowledgebase.com/sources/aad-fade-dark-spots-darker-skin-tones"},{"title":"Postinflammatory hyperpigmentation","url":"https://skinknowledgebase.com/sources/dermnet-postinflammatory-hyperpigmentation"},{"title":"Azelaic Acid","url":"https://skinknowledgebase.com/ingredients/azelaic-acid"},{"title":"Niacinamide","url":"https://skinknowledgebase.com/ingredients/niacinamide"},{"title":"Centella Asiatica","url":"https://skinknowledgebase.com/ingredients/centella-asiatica"},{"title":"How do I fade red marks after acne?","url":"https://skinknowledgebase.com/questions/how-do-i-fade-red-marks-after-acne"},{"title":"How do I get rid of red spots after pimples?","url":"https://skinknowledgebase.com/questions/how-do-i-get-rid-of-red-spots-after-pimples"}],"body_sections":[{"heading":"Quick Summary","paragraphs":["Post-inflammatory erythema, often shortened to PIE, is the red or pink-looking mark that can linger after acne calms down. It is different from brown hyperpigmentation and from indented scarring."]},{"heading":"Causes","paragraphs":["Inflammation, picking, squeezing, and irritation can leave visible red marks after blemishes. Sunscreen, time, gentle routines, and calming ingredients can help the look, while persistent vascular marks may need clinician options."]}],"key_ingredients":[{"title":"Azelaic Acid","url":"https://skinknowledgebase.com/ingredients/azelaic-acid"},{"title":"Niacinamide","url":"https://skinknowledgebase.com/ingredients/niacinamide"},{"title":"Centella Asiatica","url":"https://skinknowledgebase.com/ingredients/centella-asiatica"}],"no_product_rationale":"No ranked product is included because post-inflammatory erythema is a redness pattern where irritation risk and time course matter; the safer public guidance is gentle ingredient categories, sunscreen, and clinician signposts rather than naming a single product."}