Hello, Surgical extractions can result in swelling. You may have been prescribed a strong anti-inflammatory medication. If not, you can take one Tylenol and one Motrin to help control the spread of inflammation. This is a good combination to relieve pain and reduce swelling. Greater inflammation may relate to a large amount of infection or a very difficult, involved extraction. Realize infection changes the chemistry of the area around your tooth and this can alter the effectiveness of local anesthetics. Ask your dentist for more details about the sedation medication used for your extraction and details on known side effects. I am concerned that you report a rash. This can often indicate an allergic reaction. Where are you prescribed an antibiotic? Often after an extraction with a severely infected tooth, there will be a need for prescription antibiotic. Amoxicillin is a commonly prescribed antibiotic for dental conditions. Do you have any allergies to medications? Please stop any medications immediately that you are in risk of an allergic reaction. Inform your dentist. Otherwise, it is very important to complete prescribed medications at the correct dose and proper time intervals. Antibiotics need to be completed to be effective. Follow up with your dentist if you feel your condition is worsening and your medications are ineffective. Follow all post extraction instructions. Avoid irritants. After the initial 24 hours, be sure to continue to rinse your mouth with warm salt water. Thank you for your inquiry. I hope you begin to feel better soon.