Post-Inflammatory Hyperpigmentation
Post-Inflammatory Hyperpigmentation — flat areas of darkened skin that develop after inflammation or injury, such as acne, a rash, or a wound. It occurs when the healing process triggers excess melanin production, leaving spots that range from pink and brown to deep gray depending on skin tone.
Key points
- PIH is a response to inflammation and is distinct from the raised texture of a scar.
- It is more common and often more persistent in medium to deep skin tones.
- Sun exposure can darken existing marks and prolong how long they take to fade.
- Ingredients such as vitamin C, niacinamide, and retinoids may help support a more even tone over time.
Frequently asked
How long does post-inflammatory hyperpigmentation take to fade?
PIH can take anywhere from several months to a year or more to fade, and consistent sun protection helps prevent the marks from darkening or lasting longer.
Is post-inflammatory hyperpigmentation the same as scarring?
No, PIH is a flat change in skin color from excess melanin, while a scar involves a change in skin texture; the two can occur together but are different concerns.
Related topics
This is a foundational entry in the SYNC Skin Encyclopedia and is expanded over time. Educational information only — not medical advice.
