Thanks for getting back so quickly. He’s been on it about 5 months now has had great results for the tongue and neck cancer. Did not have any results from the original keytruda. He was referred to a dermatologist who specializes in chemo drug side effects. She put him on acutane but that did not help and has just put him on acitretin. Don’t know about that one yet only prescribed today. He doesn’t want to change or adjust the cetuximab because it is working great for him. Only the side effect is a very red painful rash on face.