Have Red Blotches On Hands And Neck, Blisters Which Itches. Using Coritzone 10

How to tell the difference in scabies, shingles, and poison ivy. I have been staying once a week in a hotel to attend classes. I woke up with some red blotches on my hands and neck. I thought it was my nerves because I was very hypervigilant about staying alone in motel. Now I have small poison ivy like blisters which itch terribly on parts of my leg, hands, and some places on my arms. I am also thinking that I came in contact with something in the motel bed linen. Thank you for some insight. I started using coritzone 10 rub on cream for what ever it is.