Can't say I've ever seen or heard of this, but I know from experience that bright red skin can be a histamine reaction. I think I'd be talking to my doctor if this was happening to me. Antihistamines might help, but if it is a histamine reaction you run a non-zero risk of serious complications....
Tammy (in Santa Barbara County)
"Courage is the price that life exacts for granting peace." ~ Amelia Earhart
"Experience is what allows you to recognize a mistake the second time you make it." ~ Unknown