Severe face rash -- Herceptin or chemo?

[rockys]

I am writing for my sister-in-law. She just finished her last round of chemo (4 A/C and 4 Taxotere -- she is Grade III, ER+, 6.2 cm. tumor). She began Herceptin with the Taxotere. The first two rounds of Herceptin/Taxotere were OK. The last have been horrible. Fatigue, nail problems, etc. But she has developed a severe face rash. It is bright red and burns. She assumed it was from the excessive eye tearing. (We also live in Phoenix, AZ. She is doing her very best to stay out of the sun but it is hot.).

She saw her Oncologist today and he was very concerned about the rash. Said he was worried it could be from the Herceptin. He is not sure and is going to send her to UCLA for a consult.

Does this ring a bell to anyone? If it is the Herceptin, could it be dangerous (be more serious than potentially not taking the medicine)? Or, could it be the Taxotere (as we assumed all along)?

Thanks

Raquel