Red Marks vs Brown Marks After Acne: PIE and PIH Explained
After a pimple heals, you may be left with a red or pink mark, a brown mark, or both. They have different causes and respond to different steps. This guide explains post-inflammatory erythema (PIE) and post-inflammatory hyperpigmentation (PIH).
For the research, the products and prices in one place, see our alpha arbutin guide.
Key takeaways
- Red or pink marks (PIE) and brown marks (PIH) are different problems with different care.
- Both fade slowly over weeks to months; sun exposure and picking make them last longer.
- Daily sunscreen is the first step for both; expert reviews describe sun protection as essential.
- Persistent or scarring marks deserve a dermatologist’s opinion.
What is the difference between PIE and PIH?
PIE is a flat red or pink mark caused by irritated or widened tiny blood vessels. PIH is a flat brown or dark mark caused by extra pigment. Darker skin tones tend to show PIH more, and both can look similar on some skin.
| PIE (red or pink) | PIH (brown or dark) | |
|---|---|---|
| Cause | Irritated blood vessels | Extra pigment after inflammation |
| Press test | Often fades briefly when pressed | Does not fade when pressed |
| Skin tone | Seen more in lighter skin | Seen more in deeper skin |
| Time to fade | Weeks to months | Months, longer in sun |
What helps each type?
For both, protect your skin from the sun every day, because sun darkens PIH and can keep PIE red. PIH is mostly managed with pigment-targeting and exfoliating ingredients over 8 to 12 weeks. For PIE, time and calming, gentle care help most; stubborn cases may need clinic procedures.
What does the research say?
- Tan et al., J Dermatol Treat, 2022: a systematic review of topical treatments for post-inflammatory hyperpigmentation found the best-quality studies for retinoids, hydroxy acids, niacinamide and other agents, recommended SPF 30 or higher sunscreen in almost every study, and noted that ongoing inflammation can be subtle in darker skin.
- Shucheng et al., Dermatol Ther (Heidelb), 2024: a randomized, double-blind trial of 72 people with mild to moderate acne compared 15% azelaic acid gel with placebo twice a day for 12 weeks, measuring both post-acne redness and hyperpigmentation.
- Wu et al., PeerJ, 2025: a network meta-analysis of acne-scar treatments found no strong evidence that any treatment reduced redness or post-inflammatory hyperpigmentation more than the others.
Where does Chelure fit in?
For brown marks, the Brightening & Anti-Aging Serum (Rs 2,500) lists 3% tranexamic acid, 3% kojic acid, alpha arbutin and AHAs. For breakouts, the Acne & Oil Control Serum (Rs 2,450) lists 2% salicylic acid and 10% niacinamide. These are cosmetics and do not treat medical conditions. See dark marks after acne. Results vary. Delivery is a flat Rs 250: 1 to 3 working days in Karachi, 5 to 7 elsewhere in Pakistan.
When should you see a dermatologist?
See a dermatologist if marks are painful, if scars or dents form, if redness persists for months, or if you are unsure whether a patch is acne.
See what customers say on our customer reviews page.
How do you tell them apart at home?
| Check | Red or pink (PIE) | Brown (PIH) |
|---|---|---|
| Color | Red, pink or purple | Tan to dark brown |
| Press with a clean glass slide or finger | May fade briefly under pressure | Color does not change |
| Texture | Flat | Flat |
| Where | Where spots were | Where spots were |
What helps each?
- Both: sunscreen every morning, no picking, a gentle routine.
- Brown marks (PIH): a brightening serum can help the look; see how to choose a serum for dark spots.
- Red marks (PIE): time and protection; ask a dermatologist about options if they persist.
How do you compare marks fairly over time?
- Photograph the marks in the same light, at the same distance, on day 1.
- Repeat every two weeks.
- Compare the photos side by side, not from memory.
- Note any weeks you skipped sunscreen or picked.
What should you expect, and how should you care for each?
| Red or pink marks (PIE) | Brown marks (PIH) | |
|---|---|---|
| Cause | Small blood vessels after inflammation | Extra pigment after inflammation |
| Brightening serum helps? | Not aimed at redness | Can help the look |
| Core care | Sunscreen, no picking, patience | Sunscreen, no picking, one brightening serum |
| See a dermatologist if | Redness persists for months | Marks persist after about 12 weeks |
Frequently asked questions
Do red marks fade on their own?
Often, over weeks to months, with sun protection.
Can I use the same product for red and brown marks?
Brown marks respond to pigment-targeting ingredients; red marks mostly need time and calm skin.
How do I tell them apart?
Press the mark: red marks may fade briefly, brown marks do not.
How long do acne marks take to fade?
Often weeks to months, and longer for deeper marks. Results vary.
Do red marks turn brown?
They can in some people, especially with sun exposure, which is another reason to use sunscreen.
Why are my acne marks purple?
Purple or pink marks are usually red-type marks from small blood vessels. They are different from brown pigment.
Sources
- Sofen B, Prado G, Emer J. Melasma and post inflammatory hyperpigmentation: management update and expert opinion. Skin Therapy Lett, 2016 (PubMed 27224897).
- Guerrero D. Dermocosmetic management of hyperpigmentations. Ann Dermatol Venereol, 2012. doi:10.1016/S0151-9638(12)70130-8 (PubMed 23522633)
A gentle reminder
This article is general information, not medical advice. Skincare helps the look and feel of your skin; it does not treat medical conditions. Patch test any new product behind the ear or on the inner arm first, and introduce one new active at a time. See our FAQ for more, or build your own routine.