Hi, Lady1
my husband had the Erbitux and, fortunately, the rash to go along with it. He was on an antibiotic to help with the rash and avoid infection (sorry, I don't remember the name). Unlike real acne, the Erbitux rash is very drying. We used regular Eucerin first, and then their Aquaphor product as treatment progressed. Don't let it get away from you! Note that lotions should be applied AFTER radiation to the target areas, not before.

If you don't already, you and he should switch to a perfume free laundry detergent. A very mild shampoo and soap is also indicated.

My husband's rash started within a week of the first injection, and stop popping new spots about three weeks after the last. Best wishes to both of you!
Maria