Thanks for the info. Upon reading the reactions to his daily medications, I believe that it might be a rash that is caused by these. He is going to check with the Doctor today.
While this might turn out to be nothing more than a dermatitis to applied ointments during cardiogram, or cathetrization still needs to get evaluated to rule out an endocarditis.
Do get back to your surgeon and get a blood culture.
Best wishes.