Hello and Welcome to ‘Ask A Doctor’ service. I have reviewed your query and here is my advice. Perhaps it is a drug induced rash/hives to some of the pre operative drug like antibiotic, anxiolytic etc that you would have been administerded.. I suggest you to take an oral antihistamine e.g tab Cetrizine once a day for a few days. In addition I suggest you to apply a soothing lotion e.g calamine lotion to calm down the rashes. Hope I have answered your query. Let me know if I can assist you further.