Our expert says:
It is difficult to say what the mass maybe. It could be fluid filled plasma/pus or it maybe a tumour benign/malignant. The best advise I can give is to request that the vet visit and insert a need and see what the composition of the mass is....we normally do a aspirate of the mass and analyse this under the microscope to give a definitive diagnosis. What is also important is to have an idea as to how long the mass has been there and whether it is still getting larger.
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