Quick answer
Active acne is current inflammation — pimples, comedones, cysts. Acne scars are the marks left behind after acne heals — atrophic (ice pick, boxcar, rolling), hypertrophic, post-inflammatory pigmentation or post-inflammatory erythema. AI distinguishes them in one scan and points each toward the right treatment.
Key takeaways
- •Active acne = current inflammation. Scars = old damage.
- •Treat active acne first, scars second.
- •PIH (brown marks) and PIE (red marks) are the most common 'scars' — they fade.
- •True atrophic scars need professional treatment.
- •AI tracking shows healing progress objectively.
What is active acne?
Active acne is current inflammation: open and closed comedones (blackheads and whiteheads), papules, pustules, nodules and cysts. The skin is responding to clogged pores, sebum and bacterial inflammation.
What are acne scars?
What people call 'scars' is usually one of four things:
Post-inflammatory hyperpigmentation (PIH) — brown marks. Common on darker skin tones. Fade over months with sun protection and brightening actives.
Post-inflammatory erythema (PIE) — red or pink marks. Common on lighter skin tones. Fade slowly; vascular treatments speed it up.
Atrophic scars — true textural depressions. Ice pick, boxcar, rolling. Need in-clinic treatment (microneedling, lasers, subcision).
Hypertrophic / keloid scars — raised tissue. Less common; need specialist care.
Why the distinction matters
Treating PIH with microneedling won't help — it's a pigment problem. Treating an ice pick scar with vitamin C won't help — it's a structural problem. Correct identification leads to correct treatment.
How AI separates them
ScanSkinAI looks at colour, texture, depth and distribution. Active inflammation reads differently from PIH, which reads differently from atrophic scarring. The report identifies each finding separately.
Treatment paths by category
Active acne: salicylic acid, benzoyl peroxide, adapalene, niacinamide. Persistent or cystic acne: see a clinician.
PIH: vitamin C, niacinamide, azelaic acid, alpha arbutin, daily SPF.
PIE: niacinamide, time, vascular laser if available.
Atrophic scars: dermatologist for microneedling, fractional laser, subcision, fillers.
Try a free AI skin analysis
One photo. 80+ visible skin conditions screened. No card required.
Try ScanSkinAIFrequently asked questions
PIH and PIE fade with time and the right routine. True atrophic scars need professional intervention but can be significantly improved.
Yes — many actives (azelaic acid, niacinamide) help both. But treating active acne first usually delivers faster overall improvement.
3–6 months with consistent SPF and brightening actives. Faster on lighter skin, slower on deeper complexions.
Yes — UV deepens pigmentation. Daily SPF is non-negotiable for anyone treating any kind of post-acne mark.
Part of the hub: Skin Concerns
Explore all 6 content clusters in our pillar guide on AI skin analysis for beauty and cosmetic dermatology.
Open the hub guide