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I am sorry to hear you are worried about Maya. I am a veterinarian and will do my best to help.
Some additional information will help. What kind of cancer was she treated for with radiation therapy?
Have any of these black spots been biopsied?
It seems unusual to treat a benign tumor with radiation therapy. What type of radiation did she have? Is the original neck tumor gone?
The first thing to do, with any spots you are worried about, is a biopsy of some kind, to look at cells from the spots under a microscope and see what the spots are. This can be done by FNA, fine needle aspiration. A small tiny needle is inserted into one or more of the spots, and the contents of the needle are examined microscopically. You can't tell what a spot or lump is by feeling it or looking at it.