I thought I'd bump this topic as I'm still having rash problems. It's actually gotten worse. It's red, hot and itchy bumps under my bad breast, groin, armpits and behind my knees. I'm taking OTC Zyrtec twice a day which helps. But I still have the itching. I have decided to stop taking Tamoxifen for two weeks to see if it helps or the itching goes away. It's been 5 days since I've taken Tamoxifen and I'm not seeing any changes yet in the itching.