Hello, I have been having redness on skin, itching, and sometimes raised skin on arms, chest, or legs. It happens for about 2 hours then goes away. I currently work in a grocery store in canada. It happens during day, sometimes on empty stomach, sometimes after having food throat and stomach turn red. I have been having problem for 2 weeks. A couple of days earlier i had travelled, stayed in air bnb home, eaten a pizza which did not taste good, and reheated the pizza the next morning. Kindly advise.