Hello,
I think that it is best to quell your concerns by seeing your vet. The heartworm should have been resolved with the treatment you were given. But your dog should still be on heartworm preventatives.
I also think that you should follow up with whomever did the surgery for you. It might be post op tracheal inflammation.















Hello,
We shouldn’t ever diagnose via a photo. We should only make a presumptive diagnosis in person after a history and examination is completed. A confirmatory diagnosis is made with a biopsy submitted to a pathologist for microscopic evaluation. But this does appear to be consistent with a benign skin growth.