My ten year old daughter was diagnoses with strep yesterday. She is is taking cephalexin and today her lower lip on the right side is swollen, she is drooling, and we took her to a quick care center this evening. They didnt have an answer except told us to apply ice. I don t know if she is irritating it herself, but don t know why they didnt suggest switching antibiotic perhaps? I am worried if she is allergic. She needs relief and is very difficult to console.