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Hello. I'm sorry you're having these tumors recur.
It sounds like they are probably mast cell tumors. Those have a high chance of regrowing if they are large and we don't get clean borders on the biopsy. If they were not biopsied, then I would remove it again and biopsy it.
For the removal, you may want to talk with a boarded surgeon. They can often times do skin flaps to make sure enough tissue is removed and decrease the chance of recurrence. They could also refer you to an oncologist to do follow up chemotherapy or radiation depending on the tumor type to give the best chance of a cure.
I hope this helps, let me know if you have any other questions.
I'm sorry for the long wait.
The only way to determine the tumor type is with a biopsy, similar to in people. We don't have a blood test to check for these types of cancer. That only helps if it's leukemia, which is not the issue here.