<s>[INST] I just had knee surgery my only known allergy is too amoxicillin and now I am broken out on both arms my knee tops of feet back and stomache in a rash that is extremely itchy and when scratched is extremely hot and welts up I have been taking benedryl and using calamine lotion for 3days now I m not sure what I m reacting too can you tell me what else I can do?? [/INST] Hi, thanks for using healthcare magicBased on your response, if you have not been exposed to amoxicillin, you have another allergy.It may be one of the medications given or food consumed.The use of the benedryl and calamine is appropriate but if the allergy is not responding to this then you may need to use steroids. Though topical steroids would help to reduce the inflammation, based on the severity, you may need oral as well.It would be best to visit your doctorI hope this helps </s>