I ate red seedless grapes last night, about 30 minutes later I had hives all over my body. I took Benadryl and put Cortizone on my hives to help with the itching. Went to bed. This morning I don t have the raised hives anymore, but I have an extreame HOT rash on my forearms, legs, butt, and feet . I am just wondering if this is another symtom from eating grapes?