Can Baxin cause a lump in back OF throat?

No. but rarely patients may experience an allergic reaction which may present as throat swelling, wheezing or rash. See a doctor asap if you experience the above!
Biaxin (clarithromycin) Biaxin (clarithromycin) should not cause a lump at the back of your throat. See your doctor to find out what that lump is.