My husband has had spinal surgery 6 days ago. He has had a itchy rash...

It is also possible that the antiseptic "prep" solution hasn't agreed with his skin. Not necessarily an allergy, possibly it was very drying, particularly if it was alcohol-based (which is currently preferred). Once the surgical drapes are applied, the solution can be on the skin for several hours. The good news is that these are typically self-limiting. Ask the surgeon which "prep" was used. He will know and be able to advise.

Best to talk to your doctor. Likely to be a het rash but sometimes medications can cause a slight rash especially those used to help with pain.
Greg

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