Hi Based on the symptoms you ve described, it s possible that you re having an allergic reaction to the amoxicillin. Allergic reactions to antibiotics can sometimes cause symptoms such as skin rash, hives, itching, and difficulty breathing. In some cases, a more severe reaction, known as anaphylaxis, can occur, which can be life-threatening. It s important to speak with your doctor or dentist about your symptoms as soon as possible, as they can help you determine whether you re having an allergic reaction or whether your symptoms are due to another cause. If you re having an allergic reaction, your doctor may recommend that you stop taking the amoxicillin and switch to another antibiotic. In some cases, an antihistamine or other medication may also be prescribed to help relieve your symptoms. If you re concerned about discontinuing the amoxicillin before your root canal procedure, it s important to discuss this with your dentist. Depending on the severity of your infection, it may be necessary to continue taking the antibiotic. However, if you re having a severe allergic reaction, it may be necessary to stop the medication immediately. It s also worth noting that exposure to mold is not typically associated with the development of an antibiotic allergy or intolerance. If you do have an allergy or intolerance to amoxicillin, it s likely that this is unrelated to your previous mold exposure. Overall, the best course of action is to speak with your healthcare provider as soon as possible to determine the cause of your symptoms and the appropriate course of treatment. Take care. Hope I have answered your question. Let me know if I can assist you further. Regards, Dr. Zia Ul Haq, General & Family Physician