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I am sorry to hear about Speedy's hematoma. My name is Rebecca. I am a veterinarian and will do my best to help.
This will resolve without treatment, but he will be left with a crinkled ear. The only cases where the ear stayed normal in appearance are where I drained the fluid from the ear daily with a sterile syringe, and put the cat on steroids for the inflammation.
It is suspected these hematomas happen because of an allergic reaction to something, so again steroids can be helpful, but you can't get that without a prescription. If you want to try something at home, you could try antihistamines, such as giving him 10 mg of Benadryl (Not Benadryl D!) 2 to 3 times daily.
Let me know if this helps, and what other questions I can answer.
Yes, you need to look at the label to see how much to give that would be 10 mg. I think the liquid comes as both 12.5 mg per teaspoon, and 25 mg per teaspoon.
And to be sure that it is just Benadryl, no other active ingredients but diphenhydramine.
It may help, but usually these cats need prescription steroids.
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