Dark Spots & Hyperpigmentation
Symptoms, Causes & Treatment
Understanding dark spots and hyperpigmentation: what causes them, why sun protection is essential, and the evidence-based treatments available to fade them.
What Are Dark Spots & Hyperpigmentation?
Hyperpigmentation is a common skin condition in which patches of skin become darker than the surrounding area. It occurs when excess melanin (the pigment that gives skin its colour) is produced or deposited in the skin. Hyperpigmentation is not harmful and is almost always a cosmetic concern rather than a medical one, but it can be a significant source of distress and reduced confidence.
Hyperpigmentation can affect any skin tone but is more common and often more pronounced in people with darker skin (Fitzpatrick skin types III–VI). It can occur anywhere on the body but most commonly affects the face, hands, chest, and other sun-exposed areas.
The main types of hyperpigmentation are:
- Post-inflammatory hyperpigmentation (PIH) -- dark marks left after skin inflammation or injury (acne, eczema, burns, cuts, insect bites). The most common form of hyperpigmentation.
- Melasma (chloasma) -- symmetrical, blotchy, brown patches, most commonly on the cheeks, forehead, upper lip, and chin. Driven by hormonal changes and UV exposure.
- Solar lentigines (sun spots / age spots) -- flat, brown, well-defined spots on sun-exposed skin, caused by cumulative UV damage. More common with age.
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Freckles (ephelides) -- small, flat, brown spots that darken with sun exposure. Genetically determined and common in fair-skinned individuals.
What Do Dark Spots & Hyperpigmentation Look Like?
Different types of hyperpigmentation have characteristic patterns and distributions that aid diagnosis.
Flat, brown, grey, or tan patches on face, neck, or hands · Darker patches in sun-exposed areas · Uneven skin tone · Post-inflammatory hyperpigmentation after acne, eczema, or injury · Melasma: symmetrical brown patches on cheeks, forehead, upper lip · Sun spots (solar lentigines) in older adults
New or changing dark spot with irregular borders, multiple colours, or rapid growth — possible melanoma · Any skin lesion bleeding without trauma · Pigmented lesion in a patient with family history of melanoma · Raised nodule or lump within a pigmented area
Seek urgent assessment for any dark spot that is new, changing, irregular in shape or colour, larger than 6mm, or bleeding. These features require dermoscopy to exclude melanoma. Do not assume all dark spots are benign.
What Causes Dark Spots & Hyperpigmentation?
Hyperpigmentation results from excess melanin deposition. The cause determines the most effective treatment approach and expected timeline for improvement.
Melanin is produced by melanocytes in response to UV radiation and inflammation. Excess melanin deposition causes post-inflammatory hyperpigmentation after acne, eczema, or injury, particularly in darker skin tones.
Melasma is caused by UV-triggered stimulation of melanocytes, worsened by hormonal factors (oestrogen, progesterone) — explaining its increased prevalence in pregnancy and women on the combined pill.
Contact dermatitis occurs when skin comes into contact with an irritant (irritant contact dermatitis) or a specific allergen (allergic contact dermatitis via type IV delayed hypersensitivity). Common allergens: nickel, latex, fragrances, preservatives.
Common eczema triggers include wool, synthetic fabrics, dust mites, pet dander, pollen, mould, soaps, detergents, food allergens (in children), and emotional stress. Identifying and avoiding personal triggers reduces flare frequency.
Psoriasis is an immune-mediated chronic inflammatory skin disease. T-cell activation drives rapid keratinocyte proliferation (3–5 days instead of 28–30), producing the characteristic thickened plaques.
Multiple psoriasis triggers are recognised: streptococcal throat infection (especially guttate psoriasis), medications (lithium, beta-blockers, antimalarials, NSAIDs), stress, trauma (Koebner phenomenon), alcohol, and smoking.
Key Risk Factors
How Is Hyperpigmentation Assessed?
Hyperpigmentation is diagnosed clinically. Wood’s light examination helps differentiate epidermal (enhanced) from dermal (unchanged) pigmentation. Dermoscopy excludes melanoma. Biopsy is performed for atypical or changing lesions.
How Is Hyperpigmentation Treated?
Treatment targets the mechanism of hyperpigmentation. A combination of SPF + topical brightening agent + retinoid gives the best results over 3–6 months.
Supportive Measures
Apply SPF 30+ broad-spectrum sunscreen daily, year-round, even on cloudy days. Use niacinamide serum (5–10%) to reduce melanin transfer. Vitamin C serum in the morning inhibits tyrosinase. Retinoids at night accelerate cell turnover. Patch test new products before applying to the face.
Managing Persistent or Recurrent Hyperpigmentation
Melasma is notoriously recurrent — rigorous daily SPF 50+ is the most important maintenance measure. For persistent PIH, combination therapy (retinoid + azelaic acid + vitamin C + SPF) gives best results. Referral to dermatology for laser or chemical peels for stubborn hyperpigmentation resistant to topical treatment.
When Should You Seek Medical Advice About Dark Spots?
Any changing dark spot with irregular borders, multiple colours, diameter >6mm, or bleeding — same-day assessment to exclude melanoma.
A dark spot is new, changing, irregular, or larger than 6mm · Topical treatments have not improved hyperpigmentation after 3–6 months · Melasma is significantly affecting your confidence · You want to discuss prescription treatments (hydroquinone, tretinoin).
How Can You Prevent and Improve Hyperpigmentation?
Most hyperpigmentation is driven by UV exposure and inflammation. These measures significantly prevent and improve it.
SPF 30+ sunscreen daily is the single most effective measure against all types of hyperpigmentation, including melasma, PIH, and solar lentigines. UV exposure stimulates melanin even on cloudy days. Apply year-round to face and neck.
Topical vitamin C (ascorbic acid, 10–20%) inhibits melanin synthesis and reduces hyperpigmentation over 3–6 months. Apply in the morning before SPF. Use stabilised formulations (L-ascorbic acid) to prevent oxidation.
SPF 50+ broad-spectrum sunscreen is the most important treatment for melasma — more important than any topical agent. Mineral-based sunscreens (zinc oxide) provide better protection against visible light which also triggers melasma.
Frequent, effective milk removal is the most important mastitis prevention. Feed or express every 2–3 hours; never skip feeds. Get breastfeeding support from a midwife, health visitor, or lactation consultant early — before problems develop.
Ensure your baby latches on deeply and correctly. A poor latch causes nipple trauma (cracks), which are an entry point for bacteria. Ask for a latch assessment if breastfeeding is painful.
Seek breastfeeding support immediately if you notice breast hardness, redness, or pain. Early identification and treatment of blocked ducts prevents progression to mastitis and abscess.
Speak to a Clinician About Hyperpigmentation
Through The GP Service, a licensed clinician can assess your hyperpigmentation, exclude concerning lesions, and prescribe effective topical treatments.
Expert clinical advice, when you need it.
Dark Spots & Hyperpigmentation FAQs
Post-inflammatory hyperpigmentation (PIH) is dark discolouration that develops after skin inflammation or injury. It occurs when excess melanin is deposited during the healing process. Common triggers include acne, eczema, insect bites, and minor injuries.
Most PIH fades naturally over 6–18 months without treatment. Protecting the affected area from sun exposure significantly speeds fading. Topical treatments (azelaic acid, niacinamide, kojic acid, vitamin C, hydroquinone) accelerate resolution.
Daily broad-spectrum SPF 30+ sunscreen is the single most important intervention for hyperpigmentation. UV exposure darkens existing spots and stimulates further melanin production. Sun protection must continue throughout treatment.
Topical hydroquinone (prescription), azelaic acid, kojic acid, vitamin C, niacinamide, and retinoids all have evidence for reducing hyperpigmentation. Combination therapy is most effective. Results take 3–6 months of consistent use.
Melasma is a hormone-related form of hyperpigmentation causing symmetrical brown patches, most commonly on the face. It is triggered by sun exposure, pregnancy, and hormonal contraception. It is notoriously difficult to treat and prone to recurrence.
Dark spots from acne are post-inflammatory hyperpigmentation, not true scars. They generally fade over months with sun protection and topical brightening agents. True acne scars (pitted or raised) are structural and require more intensive treatment.
In-clinic treatments including chemical peels, laser therapy (IPL, Q-switched lasers), and microneedling are effective for stubborn hyperpigmentation. These are performed by dermatologists or aesthetic practitioners and require sun protection throughout.
Any new or changing dark spot, particularly one that is growing, has irregular borders, multiple colours, or is over 6mm in diameter, should be assessed by a clinician to exclude melanoma. Do not assume all dark spots are benign without clinical evaluation.