Scabs in the ear nail cavity may be caused by diseases such as otitis externa, eczema of the external auditory canal or boils of the external auditory canal.
1. Otitis externa: Otitis externa is an inflammation of the skin and subcutaneous tissues of the external auditory canal due to various reasons. The patient will have edema of the skin of the external auditory canal, epidermal ooze, pain, etc. The epidermal ooze will solidify and form a crust in the ear nail cavity.
2. Eczema of the external auditory canal: Eczema of the external auditory canal is the eczema of the auricle, the external auditory canal and the surrounding area of the ear, which is most closely related to the allergic reaction. Patients will have localized itching, flaking and other symptoms, and may have different degrees of secretion oozing and crusting.
3. Boils on the external auditory canal: Boils on the external auditory canal are infections of the skin follicles of the cartilaginous part of the external auditory canal and the surrounding tissues, with the typical symptom of ear pain. After the boil bursts, pus will be discharged, which will lead to the formation of scabs inside the eustachian tube cavity.
There are many causes of crusting in the eustachian tube, so it is important to seek prompt medical attention for a definitive diagnosis.