My 7 month old grandson has urticaria , caused, according to the pediatrician , by something in his environment. Is Calamine lotion, applied to the itcy parts of the rash, safe for use on his skin? He was prescribed benedryl elixir and prednisone, advil and tylenol...all that help, but it s not enough for the areas such as inner thigh, feet. etc. Can we apply Calamine and after it dries, cover those areas with clothing to keep him from scratching and get it on his hands?