Hypopigmentation from laser treatment: what to know

A lighter patch may appear when laser energy temporarily affects pigment-producing cells, especially after treatment for hair, marks, redness, or uneven tone. The area may be smooth or may still have treatment-related dryness, redness, or sensitivity. Colour can be harder to judge while surrounding skin tans. A clinician may examine the patch, ask when it began, and review the device, settings, treatment area, and aftercare. Other causes of light patches include eczema-related change or a superficial fungal condition, so the appearance alone cannot identify the cause. See White Patches On Skin for broader symptom information.

Follow the treating clinician’s aftercare instructions and pause further laser sessions on the area until the colour change has been reviewed. Use broad-spectrum sun protection, cover the skin when practical, and avoid tanning because contrast can become more noticeable. Do not scrub, peel, or apply bleaching products to the patch. Keep the skin moisturised if it feels dry, and photograph it in consistent lighting so changes are easier to track. Treatment depends on the cause and may involve observation or prescription care; topical calcineurin inhibitors and selected light-based treatments may be discussed by a dermatologist.

Arrange a dermatology review if the patch continues to enlarge, new patches appear, the area becomes itchy or scaly, or colour does not begin to settle after the expected healing period given by your provider. Seek prompt care for blistering, open skin, marked swelling, increasing pain, pus, or fever after treatment. Bring the treatment date, device name if known, settings or treatment record, products used afterward, and photographs.

Could this be a laser-related pigment change, irritation, eczema, or infection? Should I stop further sessions, and what signs would show recovery? Which products are safe on this area, and would a referral or treatment such as Excimer Laser Therapy be appropriate?