gone fluorescent

[shrinkie]

hey, im a bit concerened about my diamond python he is about 2 yrs old and hes about 2 and a half feet, he hasnt shed recently. He is a gosford local and always been a very bright yellow but i noticed when i got him out today his stomach has gone a fluorescent green colour :? this has never happened to any of my other pythons or snakes is their anything i can do? i already has a vet coming out on sunday (thats the earliest i could get) unfortunetly i havnt got any photos but it literally looks like someone has coloured his belly in with a highlighter sorry this might sound stupid but no judging please