By Gemifys
Dark marks that linger long after a breakout has cleared are one of the most common — and most frustrating — skin concerns for people with medium to deep skin tones. Dermatologists call this post-inflammatory hyperpigmentation, or PIH, and it’s not a scar in the traditional sense. It’s the skin’s own healing response overproducing pigment after inflammation, whether from acne, a scrape, or a reaction to a new product.
Why PIH shows up more in darker skin
Melanin-producing cells (melanocytes) in richly pigmented skin tend to be more reactive to inflammation, which is why PIH is reported far more often — and can last far longer — in skin of color compared with lighter skin tones, according to a review published in the Journal of Clinical and Aesthetic Dermatology on treatment options specifically for skin of color. The good news is that PIH usually does fade with time and consistent care, even though “consistent” often means months rather than weeks.
What tends to help, according to the research
A few ingredients show up again and again in the dermatology literature as reasonable, evidence-supported options for fading PIH:
Azelaic acid. A 16-week controlled study on 15% azelaic acid gel found meaningful improvement in both post-inflammatory hyperpigmentation and the redness that often accompanies it in acne-prone skin, without the irritation profile some stronger agents carry. Research summarized in a peer-reviewed article on PubMed Central similarly found azelaic acid gel effective for both post-inflammatory erythema and hyperpigmentation in acne. That makes it a commonly recommended option for people who need pigment support without destabilizing an already-sensitive routine.
Retinoids and retinoid-like agents (including adapalene). Topical retinoids are considered a mainstay for both preventing new acne (which drives new PIH) and gradually fading existing dark marks by speeding cell turnover, though they can take longer to show a visible pigment change than they take to control breakouts.
Sun protection. This is the piece that’s easy to underestimate. UV exposure can darken existing PIH and make it take considerably longer to resolve — daily broad-spectrum sunscreen is consistently cited as a non-negotiable part of any pigmentation-fading routine, regardless of which active ingredients someone is using.
A common question: switch products, or layer them?
People navigating a PIH flare often reach a fork in the road: stick with one active and give it time, or combine treatments to move faster. This is exactly the kind of decision that benefits from an in-person read on your specific skin, current products, and how irritated or resilient your skin barrier is right now — combining actives (like a retinoid/benzoyl peroxide combination and azelaic acid) can be reasonable for some people and irritating for others. A dermatologist can look at your skin directly and help you sequence a routine safely.
The bottom line
PIH on darker skin responds to consistent, gentle, sun-protected care — but “consistent” is measured in months, and switching products every few weeks because you don’t see overnight results is one of the most common ways people accidentally prolong a flare. If your GP or dermatologist has already recommended a specific regimen, that in-person, individualized read on your skin should take priority over general information like this.
This article is for general educational purposes and is not a substitute for personalized medical advice. If you have concerns about your skin, please consult a board-certified dermatologist.
Sources
- Journal of Clinical and Aesthetic Dermatology — Postinflammatory Hyperpigmentation: A Review of the Epidemiology, Clinical Features, and Treatment Options in Skin of Color
- PubMed Central (NIH) — Effects of 15% Azelaic Acid Gel in the Management of Post-Inflammatory Erythema and Post-Inflammatory Hyperpigmentation in Acne Vulgaris
- Journal of Drugs in Dermatology — Efficacy and Safety of Azelaic Acid (AzA) Gel 15% in the Treatment of Post-Inflammatory Hyperpigmentation and Acne
