I recently started on tamoxifen after being diagnosed with breast cancer and having a radical mastectomy. I started the meds on 1/17/14. I have a terrible rash on my face, arms, hands, neck, thighs and ankles. I went to my dermatologist who took a skin biopsy and am waiting for the results. He prescribed Valtrex after deciding I have a form of herpies. ( I did have shingles 3 years ago and got the vaccine for that later on.) Now this is the second night that my face feels hot and both cheeks get flaming red. I tried applying cold towels to the face but to no results. Tonight my left cheek has flared up and I am uncomfortable.