Thank you for your question regarding your 15 year old girl Marley who has a couple of skin masses that you have noticed recently. There are a number of things these lumps could be. It certainly sounds like a papillomatous growth (or skin tag) on her neck, however it would still be worth getting your vet to have a look at this next time you have your girl in the clinic.
The mass on the left forelimb sounds like more of a concern however. This could be anything from a benign mass (like a histiocytoma
or basal cell tumor) to a malignant mass (like a melanoma
or sarcoma). For this reason, I would definitely recommend getting this mass checked by your local vet. The best next step here is for your vet to get a sample from this mass using a needle. This is a procedure called an FNA or Fine Needle Aspirate which is a quick, easy and painless procedure that can be carried out with no anaesthetic and Marley completely awake! A needle is inserted in to the lump, a syringe is used to 'aspirate' cells in to the needle hub, and then these are then placed on to a micrscope slide and sent to a pathologist for analysis. Many times a diagnosis can be gained via this FNA procedure. From this diagnosis your Vet will be able to tell you what needs to be done next, whether that is to monitor the mass or remove it under a full general anaesthetic.
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