What should you know about mandelic acid for melasma?

Melasma produces flat brown or grey-brown patches, often on the cheeks, forehead, upper lip, or jaw. Mandelic acid works at the skin surface, so any benefit is gradual and may be limited when pigment sits deeper or melasma is active. Heat, sunlight, hormonal changes, and irritation can all make the colour more noticeable. A product that stings is not working better; inflammation can make melasma harder to manage.

Use mandelic acid only when the skin barrier is comfortable, and introduce it slowly on a small test area. Follow the product directions, moisturise afterward, and avoid applying it over sunburn, eczema-like rash, cuts, or freshly waxed skin. Do not layer it at first with retinoids, scrubs, or other acids. Use sunscreen every morning and add a hat or shade, because light exposure can reactivate melasma. A clinician may recommend a chemical peel as part of a broader plan, depending on your skin tone, medical history, and current melasma activity.

Book an appointment if facial patches are new, rapidly changing, asymmetric, or not clearly flat and brown-grey. Get prompt help for swelling, blisters, severe pain, or a rash after use. Professional guidance is especially useful during pregnancy, while breastfeeding, or when melasma keeps returning despite sun protection, because treatment choices may need adjusting.

Ask whether the patches fit melasma, how often mandelic acid should be used, and which ingredients to pause. Ask about light protection, pregnancy-safe choices, and whether a supervised peel or another treatment would be more suitable.