My cat has a golf ball lump behind his ear after being outside. What's wrong?

Question

I let my (microchipped) cat out early this morning to go potty. He usually comes in pretty quickly. Called for him. Nothing. 10 hours later I find him on the porch. He's got a golf ball sized lump behind his ear on his head. No punctire site. No obvious pain. Is eating, letting me pet him, purring, wants to snuggle. Not sure what to do. Pet's info: Cat | Mixed Breed | Male | neutered | 11 years and 10 months old | 13 lbs

Menolly Cote, DVM, CVA · Accepted Answer

I'm sorry to hear of your concerns with Bagheera. The most likely causes for an acute swelling such as that shown in the picture include an abscess, trauma or allergic reaction. I would recommend that you have him seen by your veterinarian. They may recommend a fine needle aspirate of the swelling to get a better idea of what's going on. If it is an abscess, surgery may be required to drain the infection.

My cat has a golf ball lump behind his ear after being outside. What's wrong?

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