The first condition is cerumen embolism inside the ear canal. Under normal circumstances, cerumen will not appear black, but if the patient’s ear canal cerumen is stored for a particularly long time, local oxidation will occur and it will appear black, which is more common in elderly people and is caused by not taking out the ear for a long time. This is the case when you go to the hospital and use sodium bicarbonate ear drops to soften the earwax, and then let the doctor help rinse it out. The second case of long-term ear canal itching is caused by a history of long-term application of antibiotic ear drops, or a history of fungal infections such as foot fungus, which induces fungal infections in the ears, and fungal infections manifest as black mycelium growth and thus black things.