Merck Manual

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Phototherapy or "Bili Lights"
Phototherapy or "Bili Lights"

    Bili lights are a type of light therapy (phototherapy) that is used to treat jaundice in newborns. Jaundice is a yellow coloring of the skin and whites of the eyes that is caused by too much of a yellow substance called bilirubin. Blue light shined on the skin helps break down bilirubin, and most doctors use special commercial phototherapy units.

Image courtesy of William J. Cochran, MD.