Hyperpigmentation, the Complete Guide

What pigmentation is

Skin pigmentation comes from melanin, produced by melanocytes in the basal layer of the epidermis. Melanin synthesis is triggered by UV, inflammation, hormones, and certain medications. The pigment is packaged into melanosomes and transferred to surrounding keratinocytes, where it migrates upward as the epidermis turns over.

The major types

• Post-inflammatory hyperpigmentation (PIH), pigment darkening at sites of past inflammation (acne, irritation, eczema). More common and more persistent in skin of color.
• Melasma, symmetric facial pigmentation, hormone-influenced, deeper and more refractory.
• Solar lentigines (age spots), discrete UV-driven patches.
• Ephelides (freckles), small, UV-responsive, often genetic.
• Drug-induced pigmentation, certain medications cause hyperpigmentation as a side effect.
• Periorbital pigmentation, multifactorial; partly genetic, partly vascular, partly pigmentary.

What research supports, topical

• Daily broad-spectrum SPF with iron oxide (tinted), visible-light protection matters for pigmentation.
• Vitamin C 10–20% morning, antioxidant and tyrosinase inhibition.
• Niacinamide 4–5%, research suggests inhibition of melanosome transfer.
• Azelaic acid 10–20%, tyrosinase inhibition, anti-inflammatory.
• Tranexamic acid topical 2–5%, emerging evidence for melasma.
• Retinoids, accelerate epidermal turnover, improve penetration.
• Alpha-arbutin, kojic acid, licorice extract, tyrosinase inhibitors with modest evidence.
• Hydroquinone (prescription in many countries), strong tyrosinase inhibitor with restrictions.

Systemic options worth knowing

• Oral tranexamic acid, research suggests evidence for melasma at low doses; dermatology supervision required.
• Oral polypodium leucotomos, antioxidant support, supportive rather than primary.
• Glutathione, popularly used; limited high-quality evidence at this point.

Procedural options

• Chemical peels, superficial (glycolic, salicylic) and medium-depth (Jessner's, TCA).
• Microneedling with topicals.
• Pico and Q-switched lasers, for stubborn pigmentation.
• IPL, caution in deeper skin tones.

What may worsen pigmentation

• Aggressive exfoliation triggering inflammation.
• Inadequate sun protection during active treatment.
• Picking and squeezing acne lesions.
• Stopping treatment too early, pigment fades slowly even after the trigger is removed.

Timeline expectations

Pigmentation is the longest-horizon concern in cosmetic dermatology. Research suggests measurable improvement at 8 to 12 weeks for surface PIH, 3 to 6 months for deeper pigmentation, and 6 to 12 months for melasma. Maintenance is essential, melasma in particular has a high recurrence rate without ongoing photoprotection and topical support.