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Hello. Thanks for the question.
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It looks like that was some type of puncture wound that is getting infected.
For a wound like this, you can often get by with at home care.
You can do the following:1. Clip the hair from around the wound with electric clippers2. Clean the wound with a dilute hand soap and water mixture3. Apply a topical antibiotic cream on it- something like Neosporin would be fine4. Recheck and re-clean up to twice daily as needed
This should get it healed up in 5-7 days. If it becomes swollen, painful or starts draining pus then you should get to the vet for some antibiotics, pain meds and more aggressive wound care that may require surgery.
I hope this helps, let me know if you have any other questions