A lump inside the cochlea, clinically referred to as a lump inside the earnail cavity, may be caused by the following diseases. The first, a sebaceous cyst in the earnail cavity, may be caused by a local growth of a sebaceous cyst, or what is clinically referred to as a powdery tumor, after the patient has eaten spicy or irritating foods, or has stayed up late or had a fire. In this case, if the cyst is relatively large, it may need to be treated surgically. If the cyst is small, you can apply antibiotic ointment locally under the guidance of a doctor, and it can usually be absorbed slowly on its own. In the second case, the patient has a herpes zoster infection of the auricle, which can be significantly painful. There will be blister-like changes inside the cyst, and once the blister ruptures, there will be oozing and the patient will have significant pain. Once the infection invades the nerve, there will be facial paralysis, tinnitus, ear pain, and other related manifestations. Thirdly, some patients have localized tumors in the ear, commonly basal cell carcinoma, and moles, which may also have this symptomatic manifestation.