DermatologicalICD-10: L81.1Affects an estimated 1.5–33% of people depending on population; far more common in women

Melasma

Also known as: Chloasma, Mask of pregnancy, Hyperpigmentation

Melasma is a common skin condition that causes brown or grayish-brown patches, usually on the face — particularly the cheeks, forehead, bridge of the nose, and upper lip. It results from overactive pigment-producing cells and is strongly driven by sun exposure and hormonal changes, which is why it often appears during pregnancy or with hormonal contraceptives. Melasma is harmless but can be cosmetically distressing and stubborn to treat.

Symptoms

Symmetrical brown or gray-brown patches on the face
Patches commonly on the cheeks, forehead, nose, and upper lip
Darkening with sun exposure
No itching, pain, or physical discomfort
Occasionally on sun-exposed areas of the forearms and neck

Causes

  • Sun exposure (UV and visible light stimulate pigment cells)
  • Hormonal changes (pregnancy, oral contraceptives, hormone therapy)
  • Genetic predisposition
  • Certain medications and cosmetics that increase light sensitivity
  • Heat

Risk Factors

  • Female sex (far more common in women)
  • Medium to darker skin tones
  • Pregnancy
  • Use of hormonal contraceptives
  • Frequent sun exposure and family history

Diagnosis

  • Visual examination by a dermatologist
  • Wood's lamp examination to assess pigment depth
  • Dermoscopy in some cases
  • Skin biopsy rarely, to rule out other pigmentation disorders

Treatment

  • Broad-spectrum sunscreen (including tinted/iron-oxide for visible light) — the cornerstone
  • Topical lightening agents (hydroquinone, azelaic acid, kojic acid, tranexamic acid)
  • Topical retinoids and combination 'triple creams'
  • Chemical peels and laser/light therapy (carefully, to avoid worsening)
  • Oral tranexamic acid in selected cases under medical supervision
  • Stopping hormonal triggers when possible

Prevention

  • Daily broad-spectrum sunscreen, reapplied regularly
  • Wear wide-brimmed hats and seek shade
  • Use tinted sunscreens that block visible light
  • Avoid irritating skincare that can worsen pigmentation
  • Discuss alternatives if hormonal contraceptives trigger it

When to See a Doctor

  • Patches are spreading or not responding to sun protection
  • You want prescription-strength treatment
  • A pigmented spot changes in a way that concerns you (rule out other causes)
  • Melasma is affecting your confidence or quality of life

Frequently Asked Questions

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