Skin Pigmentation Guide

Pigmentation & Melasma Explained

A comprehensive guide to understanding skin discolouration — what causes dark patches, how melasma differs from other pigmentation, and the most effective treatments for an even, radiant complexion.

What Is Skin Pigmentation?

Skin pigmentation refers to the colouring of the skin, determined by a pigment called melanin — produced by cells called melanocytes in the basal layer of the epidermis. Melanin is the body's natural defence against ultraviolet (UV) radiation, absorbing and dissipating UV energy to protect the DNA in skin cells.

Hyperpigmentation occurs when melanocytes are overactivated — producing excess melanin in localised areas, leading to patches or spots that appear darker than the surrounding skin. This can affect any skin tone but is particularly prevalent and persistent in medium to deep skin tones, where melanocytes are naturally more active and reactive.

Pigmentation is one of the most complex skin concerns to treat because it has multiple possible root causes — and treatment must address the specific cause to be effective. Sun protection is the foundation of every pigmentation treatment plan, without exception.

Understanding Pigmentation

90%

Of adults experience pigmentation by age 50

5-6 M

People in the UK affected by melasma

SPF

The single most important treatment step

Skin discolouration is always a sign of something else — sun damage, hormonal influence, post-inflammatory response, or ageing. Identifying the root cause of your pigmentation is the essential first step to choosing the right treatment approach.

Pigmentation is a symptom, not a disease

UV exposure is the primary trigger and aggravator of virtually all forms of hyperpigmentation. Without daily broad-spectrum SPF 50, no topical treatment or clinical procedure will produce lasting results — pigmentation will return within weeks of sun exposure.

SPF is non-negotiable

Melasma in Depth

Adults with dark, coarse hair on any skin tone (with appropriate laser technology) · Those with PCOS or hormonal hair growth · People who wax or shave regularly and want a long-term solution · Anyone with ingrown hair problems · Patients willing to complete the full course of sessions · Those who can avoid sun exposure between sessions.

Understanding Melasma Specifically

Ideal for laser

Consider carefully

Blonde, red, grey, or white hair (lacks melanin — laser is ineffective) · Active tan or very recent sun exposure · Pregnancy (safety not established) · Certain medications increasing photosensitivity (Roaccutane, some antibiotics) · Active skin infections or open wounds in the treatment area · History of keloid scarring.

Melasma deserves special attention because it is the most prevalent, the most misunderstood, and the most challenging pigmentation condition to treat. It affects up to 6 million people in the UK alone — predominantly women — and has a significant impact on confidence and quality of life.

Melasma occurs in three layers of the skin — epidermal (surface), dermal (deeper), and mixed — which is why it is notoriously difficult to treat completely. Dermal melasma in particular does not respond well to topical treatments and requires more targeted clinical interventions. A Wood's lamp or dermatoscope examination can identify which depth your melasma sits at.

Types of Pigmentation

Not all pigmentation is the same — and the treatment approach differs significantly depending on the type. Understanding which type you have is critical before starting any treatment.

Different Types of Skin Discolouration

Symmetrical brown or greyish patches, most commonly on the cheeks, forehead, upper lip, and chin. Triggered by hormones (pregnancy, contraceptive pill) combined with UV exposure. The most difficult type to treat — requires long-term management rather than a cure.

Hormonal

Melasma

Flat, well-defined brown spots caused by cumulative UV exposure over time. Appear on areas most exposed to the sun — face, hands, shoulders, and décolletage. More common with age. Respond well to targeted treatments.

Solar lentigines (Sun spots / Age spots)

Sun-induced

Dark marks left after skin trauma — acne, cuts, burns, insect bites, or eczema. The result of excess melanin production during the healing process. More common and more persistent in darker skin tones. Generally fades with time and treatment.

Post-inflammatory hyperpigmentation (PIH)

Post-inflammatory

Pink or red marks left after acne or injury — caused by damaged blood vessels, not melanin. More common in fair skin tones. Fades naturally over months. Responds to different treatments than melanin-based pigmentation (e.g. vascular lasers).

Post-inflammatory erythema (PIE)

Vascular

Epidermal

Freckles (Ephelides)

Genetically predisposed small, flat spots that appear on sun-exposed skin. Common in fair and red-haired individuals. Darken with sun exposure and fade in winter. Generally harmless — treatment is a personal preference rather than a medical concern.

Certain medications (antimalarials, chemotherapy drugs, some antibiotics, minocycline) and topical irritants can trigger localised or widespread hyperpigmentation. Resolves in some cases after discontinuing the medication — requires medical review.

Drug & chemical-induced pigmentation

Drug-induced

Daily Routine

Gentle brightening cleanser

Use a gentle, pH-balanced cleanser — optionally containing mild brightening actives like niacinamide or vitamin C. Avoid harsh physical exfoliants or cleansers with beads or granules which cause micro-inflammation. Lukewarm water only — hot water dilates blood vessels and can worsen redness and pigmentation.

Vitamin C serum

Apply a stable Vitamin C serum (L-ascorbic acid at 10–15%, or a more stable form like ascorbyl glucoside for sensitive skin) to clean skin every morning. Allow to absorb for 60 seconds before the next step. Vitamin C pairs synergistically with SPF to neutralise UV-induced free radical damage throughout the day.

Niacinamide or tranexamic acid serum

Layer a niacinamide (5–10%) or tranexamic acid serum — both calm melanocyte activity, prevent melanin transfer, and visibly fade dark spots. These are gentle enough for daily use on all skin types. For melasma specifically, tranexamic acid is the preferred active in the morning routine.

Lightweight moisturiser

Apply a hydrating moisturiser to lock in active ingredients and maintain the skin barrier. A healthy, intact skin barrier reduces inflammation — a major pigmentation driver. Look for ingredients like ceramides, hyaluronic acid, and panthenol.

Broad-spectrum SPF 50 — the most important step

Apply a generous layer of broad-spectrum SPF 50 as the final morning step — every single day, regardless of weather or season. UV rays penetrate clouds and windows. For melasma, tinted SPF containing iron oxides provides superior protection against visible light, which is also known to worsen melasma independently of UV. Reapply every 2 hours when outdoors.

Evening treatment — retinoid or hydroquinone

Apply retinol (OTC) or prescription tretinoin to clean skin on alternating evenings, building frequency gradually. On other evenings, apply hydroquinone (2–4%), azelaic acid, or alpha arbutin. Always follow with a nourishing moisturiser to buffer irritation and support barrier recovery overnight. Retinoids increase photosensitivity — morning SPF is non-negotiable.

The Optimal Pigmentation Skincare Routine

Consistency is everything with pigmentation — results accumulate over months, not days. A focused, streamlined routine outperforms layering too many actives, which can cause irritation and worsen post-inflammatory pigmentation.

FAQ

How long does it take to fade hyperpigmentation?

It depends on the type and depth. Surface-level (epidermal) PIH from acne can fade in 3–6 months with consistent topical treatment and SPF. Sun spots typically respond within 2–4 months of targeted treatment. Melasma is the most persistent — requiring 6–12 months or more of consistent management, and ongoing maintenance thereafter. Deeper (dermal) pigmentation always takes longer and may require clinical procedures in addition to topicals.

Can I use multiple brightening actives at the same time?

Yes — in fact, combining complementary actives with different mechanisms produces better results than any single ingredient. Effective combinations include vitamin C + niacinamide (morning), retinoid + azelaic acid (alternating evenings), and hydroquinone + tretinoin + SPF. Avoid combining too many strong actives simultaneously as this can compromise the skin barrier, cause irritation, and paradoxically worsen PIH.

Is hydroquinone safe to use?

Yes — at the concentrations used clinically (2–4%), hydroquinone has a strong safety record built over decades of use. It should be used in 3-month cycles with breaks, not continuously. Concerns about ochronosis (paradoxical darkening) are associated with very high, unregulated concentrations used over many years — not standard clinical doses. Prescription-strength hydroquinone (4%) requires medical oversight and is not available OTC in the UK.

Will my melasma come back after treatment?

Almost certainly — without ongoing management. Melasma is a chronic condition. The melanocytes responsible remain "primed" and will re-activate with UV exposure, hormonal changes, or heat. This is why treatment success is measured by management rather than cure. Committing to daily SPF 50, tinted sunscreen (with iron oxides), and maintenance treatments is the most realistic long-term approach.

Can I treat pigmentation during pregnancy?

Options are limited during pregnancy as many actives are contraindicated. Safe options generally include: broad-spectrum SPF 50, vitamin C, niacinamide, and azelaic acid (considered low risk — always consult your midwife or GP). Avoid hydroquinone, retinoids, salicylic acid, and kojic acid. The "mask of pregnancy" melasma often fades naturally after delivery — avoid aggressive treatment until hormones stabilise post-partum.

What is the difference between epidermal and dermal melasma?

Epidermal melasma sits in the upper layers of the skin and appears brown under Wood's lamp examination — it responds well to topical treatments and superficial peels. Dermal melasma lies deeper, appears blue-grey, and is significantly harder to treat as topical products cannot reach the melanin deposits effectively. Mixed melasma (both layers) is most common. A dermatologist or specialist can assess your melasma type to guide the most appropriate treatment plan.

Should I see a dermatologist for pigmentation?

A GP or dermatologist is recommended if your pigmentation is widespread, appears suddenly, has changed in appearance, is associated with other symptoms, or has not responded to 3–4 months of consistent OTC treatment. Any pigmented lesion that is asymmetric, has irregular borders, multiple colours, or is growing should be assessed promptly to rule out melanoma. A dermatologist can also prescribe stronger treatments (tretinoin, 4% hydroquinone, Kligman's formula) unavailable over the counter.

Frequently Asked Questions