PIH vs. Acne Scars: What's the Difference and How to Treat Each By the Esthetics Team at From Europe With Love | Semper Amate Skincare, Palo Alto, CA   "I have acne scars" is one of the most common things clients say when they come in. And about half the time, what they're pointing to isn't scarring at all — it's PIH. The distinction matters enormously because the treatment pathways are completely different. Using the wrong approach doesn't just waste time. It can make things worse. What Is Post-Inflammatory Hyperpigmentation (PIH)? PIH is a discoloration — a flat, brown, tan, red, or purplish mark left on the skin after inflammation (like a breakout). It's the skin's response to injury: melanocytes, the cells that produce pigment, go into overdrive as part of the healing response and deposit extra melanin in the affected area. Here's what PIH is not: texture. PIH is flat. Run your finger over it and you won't feel anything different. The skin's surface structure is intact. The problem is purely pigmentary. PIH is also temporary — with the right approach, it fades. Timelines vary by skin tone, sun exposure, and treatment. Untreated and unprotected, it can linger for 6–24 months. Treated correctly, most people see significant improvement in 8–12 weeks. What Are Actual Acne Scars? Acne scars involve structural damage to the dermis — the deeper layer of skin where collagen lives. When severe inflammation breaks down collagen faster than the skin can repair it, you get depressed (atrophic) scars: icepick, boxcar, and rolling scars. When the skin overproduces collagen in response, you get raised (hypertrophic) scars. Unlike PIH, scars involve texture. They don't fade with topical products alone. They require professional treatment — which is why a thorough skin assessment matters before someone invests in a product-based solution. Why They're So Often Confused Fresh PIH can look dramatic — especially in deeper skin tones where melanin deposits more intensely. It's completely understandable to look at a dark mark and think "scar." The good news is that if it's PIH, you have real options with topical skincare. How to Treat PIH 1. Mandelic acid — your first-line option Mandelic acid works two ways on PIH: it accelerates cell turnover so pigmented surface cells shed faster, and it inhibits melanin production at the source. It's particularly well-suited for medium, olive, and deeper skin tones because its slower penetration rate reduces the risk of irritation-induced additional PIH — a real risk with stronger acids. 2. Niacinamide — fades marks while protecting the barrier Niacinamide interrupts the transfer of melanin to the skin surface, reducing the intensity of dark marks over time. Crucially, it does this without photosensitizing the skin — making it one of the safest brightening ingredients available. 3. Sun protection — non-negotiable UV exposure is the single biggest factor in PIH persistence. Every minute of unprotected sun exposure triggers more melanin production and drives pigment deeper. Daily SPF 30+ isn't optional during PIH treatment. 4. Stop picking and popping Every time you interfere with a breakout, you intensify the inflammatory response and deepen the PIH. We know it's hard. Do it anyway. How to Treat Actual Acne Scars Topical products won't structurally repair collagen damage. Professional treatments that stimulate collagen remodeling are required: •       Nano needling — creates controlled micro-channels that trigger collagen synthesis •       Chemical peels — can improve texture and reduce the depth of superficial scars over a series of treatments •       Professional modalities specific to scar type and severity At From Europe With Love, we assess the difference in your initial consultation and build a plan accordingly. No guessing, no throwing products at a structural problem. Your Next Step: Figure Out Which One You're Actually Dealing With Press on the mark. Run your finger across it. Is it flat? It's almost certainly PIH — and highly treatable with the right topical regimen. Does it have texture — indentations or raised areas? That's scarring, and you'll want a professional assessment. The Semper Amate Mandelic Serum was formulated specifically with PIH in mind — mandelic acid + niacinamide, the two most effective topical tools for fading dark marks without irritation. Shop at semperamateskincare.com, or book a consultation at our Palo Alto clinic: 3483 El Camino Real, Second Floor. 650-691-5885.