I had a very itchy, horrible rash all over my belly and sides 1 week post op. I was given Benadryl, 50mg, which helped and knocked me out. I also used a lotion called Sarna to help with the itch. My doctor could not tell me why I had the rash. The rash lasted over a week, in fact I still have signs of it 3 weeks later, but the itch lasted only a few horrible days.