Understanding Acne Scars: Types and Causes
Before you can treat acne scars effectively, it helps to understand what you're actually dealing with. Not all marks left behind by spots are true "scars" — and the distinction matters for choosing the right treatment.
- Post-inflammatory hyperpigmentation (PIH): Flat, dark or reddish marks left after a spot heals. These are not scars — they're pigmentation changes and often fade on their own over time.
- Atrophic scars: Depressed scars that sit below the skin surface. Subtypes include icepick, boxcar, and rolling scars.
- Hypertrophic scars: Raised scars caused by excess collagen production. Less common on the face.
Most people dealing with "acne scars" at home are actually treating PIH — which is good news, because that responds well to topical skincare.
The Best Ingredients for Fading Acne Marks
Your choice of active ingredients will make the biggest difference to your results. Here's what the evidence supports:
Vitamin C (Ascorbic Acid)
A well-formulated vitamin C serum brightens the skin and targets hyperpigmentation by inhibiting melanin production. Look for stabilised forms like ascorbic acid (10–20%) or more stable derivatives such as ascorbyl glucoside.
Niacinamide
One of the most versatile skincare ingredients, niacinamide (vitamin B3) helps reduce the appearance of dark spots and uneven skin tone over time. It's also anti-inflammatory, making it suitable for acne-prone skin. Concentrations of 5–10% are well-tolerated by most skin types.
AHAs (Glycolic & Lactic Acid)
Alpha hydroxy acids exfoliate the skin's surface, helping to accelerate the fading of pigmentation marks. Glycolic acid is the most potent; lactic acid is gentler and better for sensitive or dry skin types.
Retinoids
Retinol and prescription-strength tretinoin speed up cell turnover, helping both PIH and mild textural scarring. Start low and slow — retinoids can cause initial irritation, especially on acne-prone skin.
Tranexamic Acid & Alpha Arbutin
These newer brightening ingredients are excellent options for those who find vitamin C unstable or irritating. Both are well-tolerated and clinically shown to reduce hyperpigmentation.
Building a Routine for Acne Scars
- Morning: Gentle cleanser → niacinamide serum → moisturiser → SPF 30+ (non-negotiable)
- Evening: Cleanser → AHA exfoliant (2–3x per week) or vitamin C serum → retinoid (start 1–2x per week) → moisturiser
The Role of Sun Protection
SPF is arguably the single most important step in fading acne scars. UV exposure dramatically worsens hyperpigmentation and can make marks darker and longer-lasting. Use a broad-spectrum SPF 30–50 every morning, rain or shine.
What to Expect: Realistic Timelines
PIH can take anywhere from 3 to 12 months to fade significantly, depending on your skin tone, the severity of the marks, and how consistent you are with your routine. Atrophic scars — the depressed, textural kind — generally require in-clinic treatments such as microneedling, chemical peels, or laser therapy to see meaningful improvement.
Patience and consistency are key. Stick with your routine, protect your skin from the sun, and avoid picking at active spots to prevent new marks forming.