A patient with a hole in the ear that smells bad is usually considered to have a preauricular fistula, which is due to genetics. Normally, if you do not touch or squeeze the fistula in front of your ear too often, you will not develop a preauricular fistula infection. However, if the patient often touches or squeezes it with his hands, it is especially likely to cause foul discharge or even swelling in front of the ear, and in severe cases the patient will have pus flowing out. In terms of treatment, it is recommended that the patient should not touch it all the time. If the discharge comes out, it can be disinfected with iodophor, and erythromycin ointment or gentamycin ointment can be applied on the surface to play an anti-inflammatory role, and cefdinir dispersible tablets can be taken orally for anti-inflammatory purposes. If active treatment does not improve, surgery can be considered to resolve the fistula in front of the ear.