The “ear canal” is also a disease. The ear canal, also known as an ear fistula. The medical term for this is congenital preauricular fistula, which is a common otologic condition. It is caused by poor fusion of the mound-like nodules of the first and second parotid arches that form the auricle during embryonic life or by incomplete closure of the first parotid sulcus. The fistula is a blind canal that can be branched, and its external opening is often located anteriorly above the pedicle of the ear wheel. The lumen is lined with a complex squamous epithelium and contains scaly material that occasionally spills out of the fistula when squeezed around the opening. The branches of the fistula are generally short, except for a few that reach as deep as the bullae or backward to the surface of the mastoid process. Once infected, the fistula is red, swollen, painful and purulent, and can recur. The disease is an autosomal dominant disorder with incomplete ectopia. If there is no history of infection, no treatment is necessary. In acute infections, systemic antibiotics should be applied to control inflammation, and for those who have formed abscesses, incision and drainage should be performed first. For those with a history of infection, fistulotomy can be performed after the infection is controlled. The diet should be light and avoid seafood and fish and shrimp.