I had the rash pretty noticable when I first started the Tarceva (150mg)but over time the rash on the face has pretty much gone away. I use a moisturizer with no additives called Vanicream. It is great for all the dry areas of the body. DOn't know if that has helped the rash or not. I have gotten pimples pretty bad on my forearms and hands, but right now that is gone also. I had a reoccurrance of blisters on my toes and my nails split and are ugly. Right now the worst thing is the splits and cracks on the ends of my fingers, they are so sore and last a long time. They even bleed. My oncologist said the skin problems would come and go and yes, if you get the rash they think it is working better. I don't think you have to have the rash all the time for it to work. 200mg sounds pretty strong to me, the norm seems to be 150mg. Right now I'm having bouts of diarrhea and am not sure if it comes from adding the Celebrex or not. I had bouts just on the Tarceva too. I have to watch what I eat as it seems to act up if I eat food high in fat or if I drink pop. Probably isn't good for me anyhow so it is a good reason to avoid it.
Had a CT scan in the middle of Dec and it was clear like the one 4 months ago. The tumors are not visible. I'll take the side effects if I can keep those results for a long time. Are your tumors not visible also? Is your cancer just in the lungs, mine is for now. Has not gone anywhere else yet.