Ceruminous glands are the sweat glands present in outer auditory canal. These glands are simple, tubular, coiled made up of an outer myoepithelial layer of cells and inner secretory layer of cells. These glands drain in to the larger ducts, which again drain in to the guard hairs that are present in the external auditory canal where they produce earwax which is called as cerumen. Cerumen helps in keeping the eardrum lubricated, cleaning the external auditory canal, killing the bacteria, keeping the canal waterproof, and coating the guard hairs making them sticky which serves as a barrier for the foreign particles such as fungal spores, dusts etc.
These glands can develop cysts and tumors. The cysts in ceruminous glands are called as ceruminous cystomatosis. It is an uncommon non-neoplastic skin disorder of cat’s ears. These lesions are benign and affect the concave pinna and external auditory canal’s opening in most cases, but rarely affect the auditory canal. These lesions can be dangerous if left untreated because it may affect the secondary otitis externa. This can be a congenital disease (present from birth), but this condition can affect the cats of all ages, but seen most common in middle aged and older cats. The diagnosis is easy due to the appearance of the dark papules.
Cyrosurgery is a technique that is commonly used for the treatment. In this surgical process the liquid nitrogen or nitrous oxide is used to freeze the unwanted tissue and then destroy it. The frozen tissue take upto 4 weeks to fall off or dissolve. This technique is very little painful for the pets. Ther is one more method used for the treatment that known as carbon dioxide surgical laser. This technique allows for fine tuned ablation that results in minimal deformation of the pinna, because this ablation causes scar formation and tissue damage.