The disease belongs to the category of "Erchuang"(otic sore) in TCM according to its clinical manifestations. Its external cause is wind and heat attacking the exterior and the internal cause excessive fire of the liver and gallbladder. When wind and heat stir up the fire and heat of the liver and gallbladder, fire and heat will rise to scorch the ear. When the state lasts long, pathogenic heat will harm yin, causing yin deficiency. In the case of yin deficiency, the hyperactive fire will rise to scorch the ear, giving rise to skin sore. This is the main pathogenesis of the disease.