What should you know about a red light therapy unit?

The device shines light over a treatment area without removing the skin surface. A session may feel warm, or you may feel very little. Red light is different from ultraviolet light, which can damage skin. Results depend on the device, the concern being treated, your skin, and consistent use; a home unit and a clinic panel are not interchangeable.

A clinician may discuss red or near-infrared light for skin appearance, healing support, or acne-related care. Red light does not diagnose the cause of pimples or replace treatment for infection, a changing lesion, or a significant rash.

Follow the device instructions for distance, eye protection, treatment time, and frequency. Start with clean, dry skin unless your clinician advises otherwise, and avoid adding photosensitising products or medicines without checking first. Take note of redness, heat, tenderness, or irritation after each session.

Choose a regulated device and have its intended use explained. A panel designed for the face may not suit every body area. For related information, see [LED Phototherapy Panel](/technology/led-phototherapy-panel/) and [LED Light Therapy](/treatments/laser-and-energy/led-light-therapy/).

Stop using the unit and seek medical advice if you develop blistering, marked swelling, severe pain, a spreading rash, or eye symptoms. Prompt assessment is also sensible when a skin problem is rapidly worsening, draining, associated with fever, or not behaving like your usual concern. A clinician can check whether acne, including [Acne](/conditions/acne/), or another condition needs targeted care.

Ask which light range and device fit your concern, whether your medicines increase light sensitivity, how to protect your eyes, and what changes should make you stop. Ask how progress will be judged and when the plan should be reconsidered.