There are two main clinical causes of earwax in the ear canal: first, the narrowing of the external ear canal, which can cause obstruction to the discharge of earwax. Excessive earwax, and inflammation of the external auditory canal can also lead to obstruction of earwax discharge and more and more earwax accumulation. After the earwax is cleaned up, antifungal topical medication, such as Butenafine spray or compound ketoconazole, is given to the external ear canal, which usually takes one month to treat.