Hello I Am Having Some Type Of Skin Irritation. So

hello i am having some type of skin irritation. so it started as a couple red bumps at first then turned into what looks like freshly popped blisters, they dont hurt or itch they are just starting to be more and more each day. They started on my stomach and have now spread to my back. I tried a cortizone cream and an antihistamiean for a week and it didnt help.