I had ACDF surgery on 4 days ago and I developed a rash on my lower neck and chest area. The incision looks OK. Could this be an allergic reaction to steri strips, tape, or betadine solution? Or even the soft collar I was given to wear. have benadryl cream. Is it OK to use as long as I keep it away from the incision? Or should I use calomine lotion or hydrocortisone cream? I will call the doctor on Monday but the itching is terrible.