A tumor may or may not be malignant. The tumor can be removed surgically, and if there is cancer, treatment is not out of the question. An infection can be treated with an antibiotic. This condition for a dog can be quite painful. Until you can deal with the underlying cause, ask your vet about pain relief so your dog is at least comfortable.
Some dogs also suffer incontinence.
Seek a vet familiar with this condition and who has the appropriate equipment to administer the tests required for full diagnosis. The vet prescribed medication, but there was little improvement. He tried changing the food three times, but each time the problem worsened. However, when I removed the carpet, this problem began. The vet says this is just a coincidence.