Key words lichen planus mycophenolate mofetil otitis externa otitis media Abbreviations used: LP (lichen planus), MMF (mycophenolate mofetil) Introduction Lichen planus (LP) is a chronic, T-cell–mediated autoinflammatory disease that can affect the skin, nails, hair, and mucosa, particularly the mouth and genitals. Involvement of the external auditory canals and tympanic membranes has been reported previously but is extremely rare.