I feel very worried about it. We noticed it last year and didn't rush to have it removed. We tried to biopsy it but the results were inconclusive. We decided to keep an eye on it and as it was still slowly growing we went ahead with the removal but no one, including our vet was all that worried about it. More of a cosmetic issue it seemed.
I am now feeling terrible about waiting so long when it could have potentially been removed a lot earlier perhaps when it was only a stage 1.
Now, the surgery has disturbed it which I feel may be even worse.
I guess I need to wait and get more information from the vet but everything I read does not seem positive.