Hi, I had a procedure yesterday to break up a kidney stone using sound waves. In the discharge instructions, it mentions calling my doctor if I have skin changes, such as rash, itching or hives . I don t have those, but my face is flushed. I tried to call the doctor, but they close at noon on Fridays. I don t have any other issues, but I didn t know if I should use their answering service to contact the doctor on call. Hate to bother them if it is nothing to be concerned about. I am taking hydrocodone/acetaminaphen for pain and Bactrim antibiotic. I have taken both medications before with no issues. I am not having any problems urinating.