Allergic

Talking about allergic , I think I should read a lot of skin health. I always get itchy with red in my body after I eat prawn. It's make me unhappy...because I like to eat prawn very much. I like prawn in steam or anything kind of recipe, I always like it.But after have ate , my body can itchy after half hour. I ask my doctor and he said that I have allergic about seafood. And he gave me medicine and ask me to eat it after I eat seafood.