My dad, at the ripe old age of 60, started getting a weird rash on his forearm. Got a topical cream for it but it just treated it, if he didn't have the cream for a couple of days the rash would come back.
His primary doc sends him to an allergist. Comes back with the results: gluten allergy. How the !@#$ do you develop a food allergy in your 50's/60's?
It's not serious and he can have a little here and there without the rash coming back, but jeez what a pain in the ass that is.