Wiktionary
moonburn
n. (context humorous English) A hypothetical burn on the skin caused by excess exposure to moonlight.
Wikipedia
Moonburn
"Moonburn" is a 1935 American popular song written by Hoagy Carmichael and Edward Heyman. It was the first song written by Hoagy Carmichael for films and it was introduced by Bing Crosby in the 1936 film Anything Goes. A definitive jazz recording of the song was made by Crosby for Decca Records on November 13, 1935 with Georgie Stoll's Instrumental Trio featuring Bobby Sherwood on guitar and Joe Sullivan on piano.