rash after mastectomy + radiation

First a little about me. Here is my breast cancer hx: IBC Diagnosed April 07, ER/PR- Her2 +
Dose Dense AC x 4
Taxol/Herceptin 12 weekly doses
10-15-07 MRM, no cancer in breast or nodes
Completed 2x daily radiation Jan. 15, 2008
Herceptin every 3 weeks until June 2, 2007

Now I have developed a rash on my chest.  It is not along the incision line. It itches like crazy.  More of the rash is in the radiation field.  I have seen 5 doctors with this rash.  They aren't dure what it is.  Yesterday the breast surgeon took 2 skin samples and sent them to be biopsied.  

Question: Has anyone else had a similar problem and how did it turn out?  

[Havinfun]

Biopsies were negative.

[katarina777]

Very glad they are negative!

[katarina777]

One thing that causes rashes and itching after surgery, (mastectomy) is alcohol. this goes away after about 11 days, or so. So this may also apply to biopsies.

[Gord_Bennett]

Anything help the itch? It could help my wife who has similar symptoms 10 weeks after radiotherapy. It is so bad the doctor thinks it may be an allergic reaction to Tamoxifen, so we replaced that by Arimidex.