The inside of my lower lip is red swollen and very painful. What can I do for it?A couple of weeks ago I had a uti and the dr put me on a sulfa drug. After that I got a yeast infection in my mouth, once again she gave me more medication.. When that didn't work she cage aem a mouthwash which worked for awhile. But now my lower inside lip is red swollen and very painful. What sould I do?