Earwax is also known as cerumen, cerumen black sticky clinical mainly have the following considerations: the first, cerumen in the external auditory canal storage time is too long, the patient for a long time did not pull out the cerumen, resulting in cerumen in the ear canal gradual oxidation, the longer the oxidation, the cerumen will be more black. Secondly, some patients have black sticky cerumen related to their secretion system, because cerumen is mainly secreted by ceruminous glands and sebaceous glands in the ear canal, and some patients may have darker color if their secretion is more vigorous. Thirdly, some patients with fungal infections in the ear canal may present with black mucus because the secretions of fungal infections are mixed with normal cerumen and may appear as black mucus, in which case a fungal culture of the black mucus will show evidence of fungal growth.