Rash from Herceptin?

I had my first Herceptin treatment last Tuesday and thought that I had no reactions. But by Thursday I had an itchy rash on the trunk of my body. I had noticed redness after I got out of the shower on both Wednesday and Thursday but thought I had the water too hot in the shower. The onc. was not sure, said he never saw this reaction before and it could be anything. I have been using mederma for the scars from my tram flap reconstruction, and the rash was really bad by that nice scar I have across by lower abdomen. So he told me to stop that and see what happens. Then when I have my next herceptin infusion he will only give me a small dose and then wait to see if there is any reaciton. If there is none he will give me the rest of the dose in the next day or two.

Any one have any rash reaction from the herceptin?

Thanks!