Melasma, Why It Is Different, and What Research Suggests
Hormonal, UV-driven, and stubborn. Melasma has its own playbook, and aggression is usually the wrong move.
What melasma is
Melasma is a chronic, acquired, symmetric hyperpigmentation that most often appears on the cheeks, forehead, upper lip, and chin. It is more common in women than men, more common in skin of color (Fitzpatrick III–V), and strongly associated with hormonal triggers, pregnancy, combined oral contraceptives, and hormone replacement therapy.
Unlike post-inflammatory hyperpigmentation, melasma is driven by upregulated, hyperactive melanocytes rather than by a discrete inflammatory event. It is harder to clear and easier to reactivate.
Why it is hard
Melanocytes in melasma-affected skin are biologically different, research suggests they are larger, more active, and more sensitive to UV and hormonal stimulation. Even visible light (particularly the blue portion) can trigger melanogenesis in melasma-prone skin. This is why standard chemical sunscreens, which often block UVA/UVB but not visible light, can be inadequate alone.
The protocol that research supports
- Daily broad-spectrum SPF with iron oxide tint, protects against UV and visible light.
- Hydroquinone 4% (prescription), the strongest topical evidence; usually time-limited courses.
- Tranexamic acid topical 2–5%, newer, gentler evidence.
- Vitamin C 10–20%, adjunct, not standalone.
- Niacinamide 4–5%, adjunct.
- Oral tranexamic acid at low doses (250–500 mg twice daily), dermatology supervision; research suggests evidence in moderate-to-severe melasma.
- Gentle, slow chemical peel series, dermatology decision.
- Avoiding aggressive lasers in undertrained hands, IPL and Q-switched lasers can worsen melasma.
What may worsen it
- Inadequate sun protection, even one sunny day can undo months of progress.
- Combined oral contraceptives, for some, switching to a non-hormonal method matters.
- Aggressive in-office treatments without expertise, paradoxical worsening is common.
- Heat exposure, sauna, hot yoga, prolonged hot showers.
- Stress and sleep debt, likely modulators.
Timeline
Research suggests visible improvement at 8 to 12 weeks of consistent protocol, with peak effect at 6 months. Melasma is rarely 'cured', most dermatologists frame the goal as long-term management. The single highest-leverage behavior is photoprotection.
Sources
- Sarkar R et al (2017). Melasma update.
- Bagherani N, Smoller BR (2016). An overview of melasma.
- Del Rosario E et al (2018). Randomized, placebo-controlled, double-blind study of oral tranexamic acid.
- Bala HR et al (2018). Oral tranexamic acid for the treatment of melasma.