In short. Melasma is a chronic pigmentary condition driven by sun, hormones and genetics; treatment reduces and controls it, and it returns when protection stops.
Key points
- Daily broad-spectrum sunscreen, reapplied through the day, with a tinted formula containing iron oxides where possible because it also blocks the visible light that keeps melasma active.
- A hat and shade matter too.
- Without photoprotection, every other treatment underperforms and relapse is close to certain.
Melasma appears as symmetric, blotchy brown patches on the cheeks, forehead, upper lip and chin. It is far more common in women, it is more visible and more persistent in darker skin tones, and it has a strong tendency to return. The single most important thing to understand about it is that it is managed rather than cured.
What drives it
Three factors interact. Ultraviolet exposure is the strongest driver, and visible light also contributes, which is why ordinary transparent sunscreen is not always enough. Hormones matter: melasma commonly begins during pregnancy, and it can be triggered or worsened by hormonal contraception. Genetics set how strongly the pigment cells respond. Heat and inflammation add to it, which is why aggressive treatment that irritates the skin often makes melasma worse rather than better.
What else looks like melasma
Post-inflammatory hyperpigmentation from acne or dermatitis, sun-induced freckling and lentigines, and deeper pigmentary conditions such as naevus of Ota or Hori naevus are frequently mistaken for melasma, and they respond differently. Examination, sometimes with a Wood lamp or dermoscopy, helps separate them. Occasionally a pigment change is the first sign of a medication effect or a hormonal condition, and that is worth checking when the history fits.
Photoprotection is the treatment
Daily broad-spectrum sunscreen, reapplied through the day, with a tinted formula containing iron oxides where possible because it also blocks the visible light that keeps melasma active. A hat and shade matter too. Without photoprotection, every other treatment underperforms and relapse is close to certain.
What treatment can realistically do
Prescription topical agents that reduce pigment production are the mainstay, and several classes are used, sometimes in combination. Courses of pigment-inhibiting agents are usually cyclical rather than indefinite, and they require supervision. Oral agents are used in selected patients after their suitability and risks have been assessed. Procedures have a place but demand caution: energy-based devices, chemical peels and lasers can improve melasma when the diagnosis, the skin type and the settings are right, and can worsen it when they are not. Melasma in darker skin tones and in skin that has been over-treated is particularly unforgiving.
The long view
With consistent protection and supervised treatment, most people achieve substantial lightening over months. Pigment control is then maintained with continued photoprotection and often a maintenance topical routine. Sun exposure, hormonal change and heat can all bring it back, and that is not a failure of treatment; it is the nature of the condition.
Be cautious about
- Unregulated lightening creams bought online or informally — mercury and hidden steroids in these products cause real and sometimes permanent harm.
- Any product that lightens dramatically in weeks and then causes redness, thinning or a severe rebound when stopped.
- Repeated aggressive laser or peel sessions for melasma without a diagnosis and without daily photoprotection.
Frequently asked questions
Why is melasma described as managed rather than cured?
Because ultraviolet exposure, visible light, hormones and genetics all interact in it, and sun, hormonal change and heat can each bring it back. That return is the nature of the condition rather than a failure of treatment, which is why control is maintained over years.
Why is ordinary transparent sunscreen not always enough for melasma?
Because visible light also keeps melasma active, and a tinted formula containing iron oxides blocks it as well as ultraviolet. Photoprotection is the treatment: reapplied through the day, with a hat and shade. Without it, every other treatment underperforms and relapse is close to certain.
What is the risk of aggressive laser or peel treatment for melasma?
Energy-based devices, chemical peels and lasers can improve melasma when the diagnosis, skin type and settings are right, and can worsen it when they are not. Melasma in darker skin tones and in skin that has been over-treated is particularly unforgiving.
Risks & Limitations
- Most chronic skin disease is managed rather than cured, and relapse is expected.
- Treatments typically need 8–12 weeks before response can be judged fairly.
- Topical treatment can cause irritation, dryness, peeling and photosensitivity.
- Systemic therapy may require blood monitoring and carries organ, metabolic and pregnancy risks.
- Isotretinoin in particular requires strict monitoring and pregnancy prevention.
- Pigment change is often slow and may be incomplete.
- No treatment works for everyone, and response cannot be predicted with certainty.
When to Seek Care
- A mole or lesion that changes in size, shape or colour, or starts to bleed, itch or crust.
- Fever with a widespread rash, blistering, or rash involving the eyes, mouth or genitals — seek emergency care.
- Rapidly spreading redness, swelling or pain in the skin.
- Facial swelling or difficulty breathing — possible severe reaction; seek emergency care immediately.
- New or worsening symptoms while taking a monitored medication.
References & Further Reading
- American Academy of Dermatology (AAD) — public and clinical guidance
- World Health Organization (WHO) — skin and infectious disease resources
- Chinese Medical Association, Dermatology Branch — clinical guidance
- Cochrane Library — systematic reviews in dermatology
This page is patient education, not medical advice, and it does not cite individual studies. Discuss your own case with a qualified clinician. To arrange an assessment at Chongqing West District Hospital, see Contact & Consultation.