Hello doctors, I have a little question for you: is it possible to be allergic to too much sun exposure? This is not even for a story, but I've tried WebMD and all I'm getting is results for medicines used to treat serious infections. My friend has this really nasty refried-bean colored thing on the surface of her left hand. It has an odd, almost kidney-like shape and a blister forming atop it. She got it after a day spent at Six Flags. The dermatologists shaved some of it off for a biopsy, but I'm curious as to what it is now. Can anyone tell me?
(PS, to keep this in the scope of things, if it turns out to be benign and removable, I might make a character have this.)