Dog has swollen spot, hair loss, and a bloody blister. What is it?

Question

my dog was bitten 3 weeks ago by im assuming a spider of some sort. After antibiotics were taken her hair fell on the spot where she was swollen and has developed this blister that looks like blood? What is it and what can I do to help her. She doesn't seem to be in any pain. Pet's info: Dog | Chihuahua (Long Coat) | Female | spayed | 4 lbs

Angel Alvarado, LVT · Accepted Answer

It looks like it may be an abscess. In that location, an abscessed tooth root is a common underlying cause. Ideally, Daisy should be physically examined by your veterinarian. After an oral exam, dental x-rays may be recommended to confirm the diagnosis. Treatment is typically extraction of the tooth and roots. A complete dental cleaning may also be indicated if periodontal disease is present.

Dog has swollen spot, hair loss, and a bloody blister. What is it?

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