Hello, Additional bleeding and some inflammation may be a response to your new medication. Overall sensitivity may accompany this reaction. For this I recommend warm saltwater rinses and continue practicing good oral hygiene. Keep well hydrated and make sure you have proper nutrition with no vitamin deficiencies. Make your doctor aware of these symptoms. If improvement does not occur or the severity worsens, consider altering the medication. I place my patients on amoxicillin to help control infections usually related to an abscess from a single tooth. Amoxicillin can help control the spread of the infection which can give uncomfortable symptoms such as swelling, with pain. This will often occur near the site of the infected tooth for on the same side. What is the reason you were placed on amoxicillin? Do you have a respiratory, sinus, or ear infection? You may experience some throat and mouth discomfort with this condition while being treated. You may also experience a reaction to amoxicillin. This can be an allergic reaction or an oral yeast infection. Thrush may require an antifungal treatment to resolve your discomfort. Viral sores take time to heal and are also a possibility. I suggest taking some anti-inflammatory medication such as acetaminophen and ibuprofen. Benadryl, an antihistamine, also can help control inflammation. Chlorhexidine rinse is available for your use. This may stain your teeth but the stain will be removed at your next routine dental cleaning. Discuss your degree of pain with your dentist and possible choices to relieve your discomfort. Your dentist may Prescribe stronger pain relief medication, a corticosteroid, or a pain relieving mouth rinse. Nystatin may be prescribed as an antifungal medication. Thank you for your inquiry. I hope some of my suggestions will offer you some relief and they are helpful.