I have been taking Tarceva (erlotinib) 150 mg every day since April 14, 2008. I had an acne response which lasted for about 2-3 weeks. The acne then subsided and has not returned since then.
If it helps, my onco doc says that peole who have the acne/rash response are also the same people who have gotten the best results from this medication! I hope that is the case for you.
In addition to the Tarceva, I get cisplatin and gemcitabine infusion every 3 weeks. This is for primary liver cancer.
Good luck to you
Violarob in Texas