I cannot confirm anything without examination but it can be an allergic reaction to the medicine. The most important treatment for allergies is avoidance of the allergen.
Other treatment options include oral antihistaminics like benadryl and Claritin or non sedating antihistaminics like zyrtec; topical steroids for skin rashes and itching; oral steroids in more severe cases and bronchodilators in cases of difficulty in breathing and wheezing.
You need to consult a dermatologist and get it evaluated. It is very difficult to precisely confirm a diagnosis without examination and investigations and the answer is based on the medical information provided. For exact diagnosis, you are requested to consult your doctor. I sincerely hope that helps. Take care and please do keep me posted on how you are doing.