I am sorry Eggo gets repeating Hematomas. They are caused by violent head shaking or scratching.
n aural hematoma is a pool of blood that collects between the skin and the cartilage of a pet’s ear flap. It’s typically caused by overly aggressive ear scratching or head shaking that results from an ear infection. Dogs and cats can both suffer ear hematomas, though dogs (particularly those prone to skin allergies and ear infections) are more prone to them. Treatments range from draining the hematoma with a needle, to surgical correction of the problem.
These are mostly cosmetic meaning they do not harm the patient.
If you do nothing the body will absorb the fluid but the cat will be left wit a cauliflower ear.
It is best to find the source of the discomfort. If it is earmites either Ivermectin or monthly revolution will cure the problem.
There is no point in repeated surgeries because this will recur without a permanent solution.
Please let me know how he is doing .
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