Food -- outside food. And specific food!

I sometimes haves skin rashes /pimple like buldge but spread apart when I have outside food, food can be anything from white normal bread to complex chicken items or paneer from outside hotels , recently happened with bread . #Almost all the time if this happens entire body will start having rashes like said above and becomes itchy and swollen ,which might be small spread around the body ,hardly noticeable or can make body fully swollen ,noticible easily on hands and face ##I never face any of these items with any of home made items ,starting from basic rice to heavily items like chicken ,mutton,Home made cakes etc , issues happens only with outside food ## Is it possible to find cause of these issue , due to this I find hard to have outside hotel  food even if it is once per month with friends or family #Note -most of the time I prepare food only, this happens only with outside food that too not always ,due to which I always have few limited hotels which I trust and specific food