Phototherapy is a medical treatment that uses specific wavelengths of light, like ultraviolet (UV), blue, or infrared light, to treat various conditions, including skin disorders such as psoriasis, eczema, and acne, as well as newborn jaundice How it works For skin conditions: Controlled doses of UV light (like UVA or UVB) are used to slow down the production of skin cells and reduce inflammation and itching associated with psoriasis and eczema. Blue and red light can target acne-causing bacteria. For newborn jaundice: A specific type of blue light breaks down bilirubin, a yellow pigment in the blood that causes jaundice, into a form that the baby's body can more easily eliminate through urine and stool. Common applications Psoriasis and eczema: Slows down skin cell overproduction and reduces inflammation. Acne: Helps to clear existing lesions and prevent new ones by targeting bacteria. Newborn jaundice: Reduces high levels of unconjugated bilirubin in the blood. Skin rejuvenation: Stimulates collagen production for anti-aging purposes. Types of phototherapy UVB phototherapy: Uses ultraviolet B light, with common types being broad-band (BB-UVB) and narrow-band (NB-UVB). Narrow-band UVB is more effective as it uses a specific wavelength that penetrates the skin better. PUVA: Uses a photosensitizing drug called psoralen along with UVA light, which goes deeper into the skin. Laser phototherapy: Uses a focused laser beam for specific conditions, such as nail psoriasis. Photodynamic therapy (PDT): Another specialized type of phototherapy. What to expect A warm sensation on the skin may be felt during treatment. The length and frequency of treatment depend on the condition being treated. Maintenance treatments may be needed to manage chronic conditions.