Suggest Treatment For Recurring Red Rash All Over My Face And Arms

I have a reoccuring red rash around my hairline, on my forearms, behind my ear(s), spots on the side of my mouth, on the side of my nose, under my eyes, on my eyelids and it's making me crazy. It's itches like crazy. I don't get it on any other parts of my body. Not on my trunk, back, legs, stomach or chest. I've been to the dermatologist 2 times since last March. I have washed every surface in our house, including the dog (numerous times)! I was the bedding regularly. I was prescribed Pretisone and told that it was poison ivy and that I probably got it from our dog. I'm getting ready to make another appointment with my dermatologist for the same thing again. It's almost like it flares up and goes away and then it flares up, big time, and won't go away which forces me to go to the dermatologist again. I had ecxema as a baby and would like to know if that could have been triggered by something. I've never had anything like this before and just want my skin to go back to normal. I had cataract surgery on both eyes last summer and don't know if that might have had anything to do with this. Any ideas?