What causes itching inside the ear, along with yellowish discharge and a foul odor?

Itching inside the ear, accompanied by yellowish discharge and a foul odor, is usually caused by external auditory canal lesions, most commonly external otitis. External otitis is typically triggered by bacterial or fungal infections. The incidence of fungal external otitis has increased significantly compared to the past, which is associated with frequent ear picking and exposure to water during bathing. This condition can also occur when earwax, moisture, fungi, bacteria, and their secretions block the external auditory canal, leading to excessive discharge.