There are different reasons for the formation of malignant tumors of the ear, the specific reasons are as follows: 1. Malignant tumors of the auricle and external auditory canal: they are mostly malignant tumors of basal cell or squamous cell origin of the skin, mainly related to cold stimulation of climate, chronic inflammatory stimulation, or frequent contact, scratching and inflammatory reaction. Inflammation, eczema and chronic stimulation of the external auditory canal can also cause malignant tumor of the external auditory canal. Therefore, timely treatment of otitis externa and eczema of the external auditory canal must be carried out, while avoiding contact with irritating rays to avoid the formation of malignant tumor of the auricle. 2. Malignant tumor of the middle ear: Although it is of squamous cell origin, it has a great relationship with chronic suppurative otitis media and tympanic membrane perforation. The middle ear cholesteatoma is also a very important factor in the formation of middle ear malignancy. Therefore, if there is chronic suppurative otitis media, early diagnosis and early treatment are needed to control the chronic suppurative otitis media in order to prevent repeated inflammatory stimulation and malignant transformation of middle ear cancer years later.