Unfortunately without seeing the rash myself, and knowing what type of antibiotic you are on, there is no way to be sure what is causing it. Since it is possible that the rash is related to the antibiotic, you should get it checked out soon. Antibiotics can cause rashes for a few different reasons. It is possible that you have an allergy to the medicine. Allergies to the penicillin family of antibiotics are common and a rash can be a manifestation of this allergy. Antibiotics also can be the culprits in developing candida (yeast) infections especially in moist areas of the body. This is because antibiotics can sometimes kill off the normal skin bacteria allowing for yeast to grow. My suggestion is that you contact the physician that prescribed the antibiotic to discuss your new symptoms. I would only stop the drug if your doctor
says to (the antibiotic is likely important to prevent a soft tissue infection around your wound) unless you develop hives
or shortness of breath (then stop it right away and call you doctor). He or she may have you schedule an appointment to take a look at the rash and determine the cause. If it is a drug allergy
, then you may have to switch to another antibiotic. If the rash is a yeast infection, you may need a topical anti-fungal cream.