Thought that, I'm also allergic to temperature change. Only from cold to hot (not hot to cold) brings me out in hive's. Means I cant have a meal & a cuppa during winter at the same time as it's to much of an internal temp rise. Also you try explaining that to mate's as the reason you wont get the 1st round in at the pub as you don't want come out in a rash from standing in a crowd at the bar! lol