Jaundice is a yellowing of the skin or other organs caused by the accumulation of bilirubin in the body, and increased unconjugated bilirubin is the most common form of jaundice in newborns. Light therapy is an effective way to reduce unconjugated bilirubin. The treatment involves removing clothing to expose the skin, but care should be taken to protect the eyes and perineum. For jaundice caused by elevated serum unconjugated bilirubin, light therapy, or phototherapy for short, is a simple and effective method. Phototherapy mainly acts on the superficial tissues of the skin to photoisomerize unconjugated bilirubin, forming conformational and structural isomers, which are water-soluble and can be excreted directly through bile and urine without hepatic processing. Factors affecting the efficacy of phototherapy include the amount of body surface area exposed to light, so the skin needs to be exposed during treatment by removing clothing, but care needs to be taken to protect the eyes with a black eye patch to avoid damage to the retina. The perineal and anal areas also need to be covered with diapers, etc., and the rest exposed. It is recommended to consult a specialist for the relevant treatment.