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Hi there, this is Dr. Gabby. I know you probably want to know exactly what they are but that would take a fine needle aspirate or a biopsy to determine what type of cells they are. How quickly are they growing?
That is getting pretty large. I think it needs to be surgically removed and sent off for a biopsy.
The best thing that will happen is the vet will say it came back benign.
Usually cancerous masses grow rapidly like 2-3 times in size in a month.
And sometimes benign masses can turn cancerous.