What should you know about light therapy for hyperpigmentation?

Hyperpigmentation means an area of skin is darker because pigment production or distribution has changed. Causes include sun exposure, inflammation after a rash or injury, medicines, hormonal influences and other skin conditions. Light-based treatment may target pigment in selected lesions, but heat or irritation can sometimes deepen colour, especially in skin that marks easily.

A clinician should assess the colour, border, location, duration and change over time before treatment. A new, changing, bleeding or unusual dark patch should not be treated cosmetically until it has been examined.

Use gentle skincare and consistent broad-spectrum sun protection while the cause is clarified. Do not pick, scrub or layer irritating products over the area. Ask whether IPL photofacial, picosecond laser treatment, a chemical peel, skin brightening treatment or hydroquinone treatment fits the diagnosis and your skin type. Follow preparation and aftercare instructions closely, including guidance about heat, sun and active skincare. Progress should be judged by photographs or examination under similar conditions, not by day-to-day colour changes.

Seek medical assessment for a patch that changes quickly, becomes asymmetric, develops several colours, crusts, bleeds, hurts or fails to heal. After treatment, contact the provider for blistering, severe pain, open skin, worsening swelling, infection signs or pigment change that keeps intensifying. Urgent care is needed for facial swelling, widespread hives or breathing difficulty.

Ask: What is causing this darkening? Could it worsen after energy or chemical treatment? Which option suits my skin type and location? What preparation, sun protection and aftercare will reduce irritation? When should a changing patch be rechecked?