If you want to detained what the mass is then I would advise that you go to your local vet and have him/her do a fine needle aspirate and then look at the cytology to identify the lesion.
Your veterinarian will be able to advise on the cytology results as to wether or no you should remove the lesion or not.
The information provided does not constitute a diagnosis of your condition. You should consult a medical practitioner or other appropriate health care professional for a physical exmanication, diagnosis and formal
advice. Health24 and the expert accept no responsibility or liability for any damage or person harm you may suffer resulting from making use of this content.