Melasma & Skin Pigmentation: Causes, Diagnosis & Treatment Options
Hyperpigmentation and melasma are among the most frequent dermatological concerns brought to general practice in South Africa. Characterised by irregular dark patches or spots, hyperpigmentation results from overproduction of melanin in response to sunlight, hormonal triggers, or cutaneous inflammation. Understanding the distinct types of pigmentation is essential for choosing safe, effective clinical treatments.
What Is Melasma?
Melasma is a chronic acquired hypermelanosis condition that causes symmetrical brown, grey-brown, or dark patches on sun-exposed areas of the body—most commonly the face (cheeks, forehead, bridge of the nose, upper lip, and chin) and occasionally the neck or forearms.
Melasma is particularly prevalent among women (especially during pregnancy, where it is often referred to as the “mask of pregnancy” or chloasma), individuals with darker skin phototypes (Fitzpatrick scale IV–VI), and those living in regions with high solar radiation.
Causes & Triggers of Melasma and Hyperpigmentation
1. Hormonal Influences
Estrogen and progesterone stimulate melanocyte activity, making hormonal shifts a primary driver of melasma:
- Gestation (pregnancy-induced hormonal surges)
- Combined oral contraceptives or progesterone-releasing implants
- Hormone replacement therapy (HRT)
2. Ultraviolet (UV) & Visible Light Exposure
Ultraviolet A (UVA) and Ultraviolet B (UVB) rays directly induce melanogenesis (pigment production). Emerging clinical evidence highlights that high-energy visible (HEV) blue light from digital screens and intense indoor lighting also exacerbates melasma, making year-round protection essential.
3. Photosensitising Medications & Products
Certain oral prescription drugs (such as specific antibiotics, NSAIDs, or anti-seizure medications) and harsh cosmetic products can sensitise melanocytes, predisposing the skin to patchy discolouration when exposed to sunlight.
4. Cutaneous Inflammation
Post-Inflammatory Hyperpigmentation (PIH) develops following localized skin trauma, acne breakouts, eczema flares, or invasive cosmetic procedures that leave localized dark marks behind.
Other Common Types of Skin Pigmentation
| Condition | Clinical Presentation | Underlying Etiology |
|---|---|---|
| Post-Inflammatory Hyperpigmentation (PIH) | Flat, darkened macules or spots remaining after inflammatory lesions heal. | Secondary to acne vulgaris, eczema, burn injuries, or aggressive cosmetic treatments. |
| Freckles (Ephelides) | Small, well-defined tan or light brown spots appearing on sun-exposed areas. | Genetically determined, darkening with direct solar exposure. |
| Solar Lentigines (Sun / Age Spots) | Larger, sharply demarcated brown macules that persist independently of sun exposure. | Accumulated long-term UV damage, commonly appearing in older adults. |
| Vitiligo | Depigmented, chalk-white macules or patches. | Autoimmune destruction of functional melanocytes. |
| Cutaneous Melanoma | Asymmetrical, dark, or irregular pigmented lesions with expanding borders. | Malignant transformation of melanocytes requiring urgent diagnostic dermatological biopsy. |
Evidence-Based Treatment Options
1. Rigorous Photoprotection (The Foundation)
Topical lightening agents cannot succeed without strict photoprotection:
- Daily broad-spectrum sunscreen offering SPF 30 to 50+ with high UVA and blue light protection.
- Preference for physical (mineral) blockers containing zinc oxide or titanium dioxide, which reflect light rather than absorb heat.
- Tinted sunscreens containing iron oxides, which provide superior protection against visible blue light.
- Physical protection including wide-brimmed hats and avoiding peak midday ultraviolet radiation.
2. Prescription & Topical Treatments
| Topical Ingredient | Primary Clinical Function | Prescribing Considerations |
|---|---|---|
| Hydroquinone (2%–4%) | Gold-standard tyrosinase inhibitor that halts melanin production. | Prescription-only; used in short cycles under doctor supervision to avoid side effects like ochronosis. |
| Tretinoin (Topical Retinoid) | Accelerates epidermal cell turnover and enhances drug penetration. | Requires strict nighttime use and daily sun control due to increased photosensitivity. |
| Topical Corticosteroids | Reduces vascular and melanocyte inflammation. | Prescribed for short-term application, frequently combined in triple-combination creams. |
| Azelaic Acid (15%–20%) | Selectively targets hyperactive melanocytes and reduces inflammation. | Highly effective for both PIH and melasma; safe for use during pregnancy. |
| Kojic Acid & Tranexamic Acid | Inhibits pigment pathways and vascular signaling. | Available in specialized topical formulations or oral prescription options for recalcitrant melasma. |
| Vitamin C (L-Ascorbic Acid) & Niacinamide | Antioxidant support that reduces pigment transfer and brightens skin. | Complements prescription topical therapies. |
3. In-Office Medical Procedures
Procedural therapies should be approached cautiously in individuals with darker skin tones (Fitzpatrick IV–VI) to prevent triggering severe rebound Post-Inflammatory Hyperpigmentation:
- Superficial Chemical Peels (e.g., Glycolic or Salicylic Acid): Exfoliates hyperpigmented epidermal cells to accelerate fading.
- Microneedling (Collagen Induction Therapy): Facilitates deeper transdermal drug delivery of pigment-inhibiting serums.
- Laser Therapy (e.g., Low-Fluence Q-switched Nd:YAG): Targets dermal pigment fragments; requires careful execution to avoid inflammatory pigment rebound.
Clinical Timeline & Long-Term Prevention
- Topical Regimens: Measurable lightening typically requires 4 to 12 weeks of consistent daily application.
- Preventing Recurrence: Melasma has a high recurrence rate; ongoing maintenance using non-hydroquinone lighteners (such as azelaic acid or tranexamic acid) alongside strict daily photoprotection is recommended.
- Avoid Skin Trauma: Refrain from picking or aggressively scrubbing acne or hyperpigmented spots, as localized mechanical friction worsens pigment deposition.
Need Medical Diagnosis or Prescriptions for Skin Pigmentation?
Consult with Dr. Shireen Surtee at doctorinyourpocket.co.za for a thorough medical evaluation, tailored topical prescription guidance, or specialized referral.
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