I am experiencing severe itching of my back, and using a back scratcher feels so good, I don t want to stop. My wife said it looks like I have a rash on my back, and she noticed what looks like a bruise on my lower left side of my back although I don t remember hitting it, and it is not sore. The only medication I take is 10mg of Norvasc which I started about 2 months ago, and was switched from 160mg of Diovan to Norvasc two months ago for high blood pressure. I m thinking it could be from the Norvasc. My doctor switched me because of swelling of my tongue and jaw while using Diovan.