Melasma vs. Post-Inflammatory Hyperpigmentation (PIH): Key Differences Every Indian Skin Needs to Know

Hyperpigmentation is one of the most common skin concerns in India, affecting people across all ages and genders. Two conditions that often get confused are melasma and post-inflammatory hyperpigmentation (PIH). While both cause dark patches or spots, they have different causes, patterns, triggers, and treatment approaches. Getting the diagnosis right is crucial because the wrong approach can worsen the condition or delay results.

This guide breaks down the differences clearly so you can understand what you’re dealing with and take the right steps.

What is Melasma?

Melasma is a chronic acquired pigmentation disorder characterised by symmetrical, brownish-grey patches on the face. It is often called the “mask of pregnancy” when it appears during pregnancy, but it can affect anyone.

Common locations: Cheeks, forehead, bridge of the nose, upper lip, and chin (centrofacial, malar, or mandibular patterns). Who it affects most: Primarily women (about 90% of cases), especially those aged 20–50. In India, 20–30% of women between 40–65 years show facial melasma. Men can get it too, though less commonly. Main triggers:

• UV and heat exposure (major exacerbating factor)
• Hormonal changes (pregnancy, oral contraceptives, hormone replacement therapy)
• Genetic predisposition
• Thyroid disorders or certain medications

Melasma occurs due to overactive melanocytes stimulated by hormones and UV/heat. It can be epidermal (superficial), dermal (deeper), or mixed. It tends to be persistent and often recurs without ongoing maintenance.

What is Post-Inflammatory Hyperpigmentation (PIH)?

PIH is a secondary pigmentation issue that develops after skin inflammation or injury. The skin produces excess melanin as part of the healing response, leaving behind dark marks.

Common triggers in Indian skin:

• Acne (the leading cause — over 70% of people with acne history under 35 show PIH marks)
• Eczema, psoriasis, or other inflammatory conditions
• Insect bites, cuts, burns, or trauma
• Aggressive skincare treatments, chemical peels, or lasers (especially if not suited to darker skin tones)
• Contact dermatitis or irritation from products

Appearance: Irregular, localised dark spots or patches that follow the exact shape and location of the previous inflammation. It can appear anywhere on the body, not just the face. Who it affects: Any gender or age, but more noticeable and persistent in Fitzpatrick skin types IV–VI (common in India). Prognosis: Often improves over months to a couple of years if there is no new inflammation, though it can linger, especially if dermal.

Melasma vs PIH: Side-by-Side Comparison

How to Tell Them Apart

• Symmetry check: Melasma is usually symmetrical on both sides of the face. PIH is often one-sided or irregular and matches previous acne spots or rashes.
• History matters: Did dark patches appear gradually without any prior breakouts or irritation? More likely melasma. Did they appear after pimples, rashes, or treatments? Likely PIH.
• Location: Purely central face + hormonal history points to melasma. Spots on cheeks, jawline, or body following inflammation point to PIH.
• Note: Self-diagnosis can be tricky. A dermatologist can confirm using clinical examination, Wood’s lamp, or dermoscopy.

Treatment Approaches: Similar Tools, Different Strategies

Both conditions respond to strict sun protection as the foundation. Broad-spectrum SPF 50+ (with good UVA/UVB + infrared/heat protection), reapplication every 2–3 hours, hats, and shade are non-negotiable.

Shared effective ingredients (science-backed and suitable for Indian skin):

• Niacinamide — Brightens, strengthens barrier, reduces inflammation
• Azelaic acid — Excellent for PIH (especially acne-related) and some melasma; anti-inflammatory
• Tranexamic acid (topical or oral) — Particularly helpful for melasma
• Retinoids (adapalene, tretinoin — under guidance) — Increase cell turnover
• Vitamin C, kojic acid, licorice extract — Antioxidant brighteners
• Short-term hydroquinone (under dermatologist supervision only)

Key differences in approach:

• For PIH: Treat the root cause first (e.g., control active acne, avoid irritants). Once inflammation stops, fading becomes much easier.
• For Melasma: Focus on hormonal management (if applicable) + rigorous photoprotection. Maintenance therapy is often needed long-term. Oral tranexamic acid or cautious chemical peels may be added by a dermatologist.
• Procedures: Both can benefit from peels, lasers, or microneedling, but darker Indian skin has higher risk of inducing more PIH. Always choose an experienced dermatologist.

Important warning: Avoid steroid creams, fairness creams with high mercury/hydroquinone, or unsupervised strong actives — these are common in India and can cause more pigmentation, thinning, or rebound issues.

Results take time (usually 3–6+ months of consistent care). Patience and consistency win.

Prevention Tips That Work for Both

1. Daily photoprotection — Sunscreen every morning, rain or shine.
2. Gentle skincare — Avoid harsh scrubs, over-exfoliation, and picking at acne or skin.
3. Manage inflammation early — Treat acne, eczema, or irritation promptly.
4. Hormonal awareness — Discuss alternatives with your doctor if on contraceptives and prone to melasma.
5. Antioxidant support — Diet rich in fruits/vegetables + topical antioxidants.
6. Barrier health — Moisturise well; a healthy barrier resists pigmentation triggers.