Acne and Scarring: An Evidence-Based UK Guide

Reviewed by Imperial Bioscience Laboratories

Acne and the marks it leaves behind affect every generation. The breakouts themselves are difficult enough; the scarring, discolouration, and post-inflammatory pigmentation often last longer than the active acne and carry their own weight on confidence. This guide explains why scars form, what genuinely helps, and how an evidence-based skincare routine can restore an even, calm complexion over time.

Why Acne Scars Form

Acne is fundamentally an inflammatory condition. When pores become clogged with sebum, dead skin cells, and bacteria, the body responds with inflammation. The longer that inflammation persists, the more likely the surrounding tissue is to be damaged. Collagen production responds to the injury, and depending on how the skin heals, the result can be either a depressed scar (atrophic), a raised scar (hypertrophic), or a flat dark mark (post-inflammatory hyperpigmentation, or PIH).

Several factors influence how acne scars develop:

The first is age. As skin loses collagen over time, its capacity to heal evenly diminishes. Younger skin tends to heal more efficiently, though it is also more prone to new breakouts.

The second is the depth and severity of the original lesion. Cystic and nodular acne, which inflames deeper layers of the skin, almost always leaves some form of mark. Surface comedones rarely cause scarring unless picked or aggressively treated.

The third is skin tone. Deeper skin tones are more prone to PIH and less prone to red or pink post-inflammatory erythema. Lighter skin tones often see red or pink marks that fade over months. Both respond to treatment, but the approach differs.

The fourth is what happens after the breakout. Picking, harsh scrubbing, or unprotected sun exposure all deepen and prolong scarring. The most important rule is restraint: leave the skin alone, treat it gently, and let it heal.

The Order of Operations

Effective treatment requires the right sequence. Many people make the mistake of focusing on scar fading while active acne continues to develop. The result is new marks forming as quickly as old ones fade.

The first priority is bringing the active acne under control. This may involve consistent over-the-counter treatment, a dermatology consultation for prescription options, or both. Only when new breakouts have substantially reduced does scar treatment become productive.

The second priority is calming inflammation. Hot, irritated skin produces more pigmentation. Cool, well-hydrated skin heals more evenly.

The third priority is targeted treatment of the marks themselves. This includes barrier support, brightening actives, and consistent sun protection.

Treating the Inflammation: Where to Start

For mild to moderate breakouts, over-the-counter ingredients form the foundation. Salicylic acid penetrates pores and dissolves the buildup that drives comedones. Benzoyl peroxide reduces the bacteria associated with inflammatory acne. Niacinamide regulates oil production while calming redness.

For moderate to severe acne, particularly the inflammatory kind that leaves the deepest scars, a dermatology consultation produces the best outcomes. Retinoids, antibiotic creams, and prescription oral medication all have a place under medical supervision.

Whatever the treatment, hydration is non-negotiable. Stripped, dry skin overproduces sebum, which worsens the cycle. A well-formulated Rossa 2-step hydrating sheet mask supports the barrier without clogging pores, and provides the controlled hydration that distressed acne-prone skin requires.

Managing Discolouration After Acne

Once active acne is controlled, the marks left behind become the focus. Post-inflammatory hyperpigmentation and erythema respond to a combination of barrier support, brightening actives, and time.

The most evidence-backed brightening ingredients include niacinamide for melanin transfer disruption, ascorbyl glucoside (a stable vitamin C derivative) for tyrosinase inhibition, tranexamic acid for inflammation-driven pigmentation, and hyaluronic acid for the barrier function that allows the other ingredients to work.

For the eye area, where the skin is thinner and more sensitive to active ingredients, our Luminance eye serum combines brightening peptides and green algae with a formula gentle enough for daily use morning and evening.

For the rest of the face, twice-weekly application of Rossa supports gradual pigmentation reduction. The 2-step format applies a brightening serum followed by a deep-hydration sheet mask, which both delivers actives and supports the barrier that allows them to work.

Other Approaches to Consider

For at-home maintenance, gentle chemical exfoliation with low-concentration glycolic or lactic acid (under 8 percent) once or twice a week supports cell turnover and gradual fading. These should be introduced slowly and never combined with aggressive scrubs.

Vitamin C serums, applied in the morning before SPF, support pigmentation correction and protect against ongoing UV damage that would deepen existing marks.

For clinical interventions, chemical peels at medium depth, microneedling under professional supervision, and laser treatments such as IPL and fractional resurfacing can produce significant improvements when at-home protocols have plateaued. The right choice depends on skin tone, scar type, and what consistent home care has not been able to address.

Building an Anti-Acne Skincare Routine

A reliable routine for acne-prone and scar-affected skin looks like this:

Morning: Gentle cleanser, vitamin C serum or Luminance eye serum for the under-eye area, lightweight moisturiser, broad-spectrum SPF 50.

Evening: Gentle cleanser, targeted acne treatment as needed, Luminance eye serum around the eyes, moisturiser.

Twice weekly: Rossa 2-step hydrating sheet mask for barrier support and gradual pigmentation correction.

Once weekly (optional): Gentle chemical exfoliation, alternated with the Rossa treatment to avoid layering acids.

Explore the full Hyperpigmentation collection for products designed to work as an integrated protocol.

What to Avoid

Tanning beds and unprotected sun exposure deepen acne marks substantially. UV radiation triggers more melanin production in already-active melanocytes, and the resulting hyperpigmentation can take months longer to fade.

Picking and squeezing active lesions almost always leads to a longer, deeper scar than the original breakout would have caused. The discipline to leave the skin alone is the single most underrated factor in scarring prevention.

Aggressive physical scrubs cause micro-tears in the skin and provoke more inflammation. Gentle chemical exfoliation produces better results with less damage.

Stacking multiple aggressive actives in the same routine causes inflammation, which is the very mechanism that drives PIH. Layer carefully, introduce new products one at a time, and pull back at the first sign of irritation.

DIY remedies with lemon juice or apple cider vinegar are particularly risky. The photosensitisers in citrus can cause phytophotodermatitis, a severe form of post-inflammatory pigmentation that is harder to treat than the marks you were trying to fade.

Frequently Asked Questions

How long does it take for acne scars to fade?

Post-inflammatory hyperpigmentation typically begins to fade within four to six weeks of consistent treatment, with substantial improvement over three to six months. Deeper atrophic and hypertrophic scars are slower to respond and may require clinical interventions such as microneedling or laser to see significant change. Patience and consistency outperform aggressive intervention for the majority of cases.

Can over-the-counter products really treat acne scars?

Over-the-counter products effectively address surface marks and post-inflammatory hyperpigmentation, particularly when combined with consistent sun protection. Deeper atrophic scarring typically requires clinical intervention. Look for niacinamide, tranexamic acid, vitamin C derivatives, and gentle retinoids in your at-home routine.

Should I treat the acne or the scars first?

Bring active acne under control first. Treating scars while new breakouts continue produces new marks faster than the old ones fade. Once your skin is calm and breakouts are rare, the scar treatment phase can produce meaningful improvement.

Does sun protection really matter for acne scars?

Yes, profoundly. UV exposure deepens existing pigmentation and triggers new pigmentation in healing skin. Daily broad-spectrum SPF 50 is the single most effective protection against acne marks becoming permanent.

What ingredients should I look for to fade acne marks?

The strongest at-home ingredients are niacinamide for melanin transfer disruption, ascorbyl glucoside or vitamin C for tyrosinase inhibition, tranexamic acid for inflammation-driven pigmentation, and gentle retinoids for cell turnover. Hyaluronic acid supports the barrier function that allows the other ingredients to work effectively.

Are chemical peels and microneedling safe for darker skin tones?

Both can be performed safely on deeper skin tones, but the risk of post-inflammatory hyperpigmentation from the treatment itself is higher. Practitioner selection matters enormously. Conservative concentrations and depths, performed by an experienced practitioner familiar with melanin-rich skin, produce the best outcomes.

When should I see a dermatologist?

Consult a dermatologist for moderate to severe acne that does not respond to over-the-counter treatment, for persistent cystic acne, or for atrophic scarring that has not improved with consistent at-home care over three to four months. Prescription protocols and clinical interventions can substantially accelerate progress.

Can I use Luminance eye serum and Rossa together?

Yes. Luminance eye serum is designed for daily morning and evening use around the eye area, and pairs well with twice-weekly Rossa sheet mask treatments on the rest of the face. The two products address different concerns in different areas without overlap.

The Honest Path Forward

Acne and scarring respond to a calm, consistent routine rather than aggressive intervention. Bring breakouts under control, support the skin barrier, introduce brightening actives gradually, and protect from UV daily. The marks fade slower than anyone wants, but they fade reliably when the underlying triggers are managed and the routine is held over months rather than weeks.

Explore the Hyperpigmentation collection for products designed around this protocol, and consider the Rossa 2-step mask as your weekly intensive while building a daily routine that holds.