<s>[INST] My son was diagnosed with strep throat on Thursday. They prescribed him amoxicilin (give twice a day) and told me to continue to alternate tylenol and ibproufen. I have been doing as the directions say and today he is complaining of his mouth hurting and he went to brush his teeth and his gums were bleeding. His gums are also swollen and it looks like his lips are swelling up as well. Are these symptoms due to the strep, or is he having a allergic reaction to the medicine. Also, his father is allergic to amoxicilin. [/INST] Thanks for your query, I have gone through your query.The swelling in the lips and gums looks like it is secondary to allergic reaction to amoxicillin resulting in angoedema. Stop taking amoxicillin and consult your pediatrist and get it ruled out. The other cause of bleeding gums can be a gum infection secondary to deposits, so get the teeth cleaned.I hope my answer will help you, take care. </s>