The major diagnosis from which to separate<unk>  is<unk> rcinoma, which shows an infiltrative growth, pleomorphism, mitoses, necrosis, and lacks ceroid pigment granules. Other tumors which need to be excluded include a neuroendocrine adenoma of the middle ear (middle ear adenoma), paraganglioma, and endolymphatic sac tumor.
Ceruminous adenoma
Sebaceous adenoma
Basal cell adenoma
Pilomatricoma
Ganglion cyst
Sebaceous hyperplasia
Nevus of Ota
Keratin implantation cyst