Hi, my Son who's 1 year and a month old is experiencing on and off rashes, it atarted last Friday when I let him eat 1 spoon of fish. We went to the hospital yesterday and he was given antihistamine, after 2 hours the rashes was gone but it came back again last night and earlier this morning. Some says, it might be because of the weather. We're not really sure. Please help. He's taking meds right now, suggested by his pediatrician to take for 3 days