Hello I am Dr. Joey. Thanks for trusting me to help you and your pet today. I am a licensed veterinarian with over 15 years of experience. I look forward to working with you.
This all sounds very optimistic for the mass you discovered. Masses that are stable in size (not changing dramatically) and move around are generally good. However, if this is dramatically changing in size/shape, draining or irritating/painful then it could be an area of infection and that warrants a visit to see his veterinarian as soon as you can arrange this. It could be an abscess or focal bacterial infection which will require drainage and then antibiotics to clear.
If this is truly a mass/nodule/tumor then what is reassuring is that the majority of mobile dermal masses are benign in cats. However, it is always good to have your veterinarian take a look. There are a few non-benign masses we see in cats and the sooner these are identified and removed,the better. If it is not irritating him and not changing much, then you can monitor for a bit and have it checked at your convenience over the next few weeks. A fine needle aspiration by your veterinarian and view of this under the microscope or submission of the sample to a pathologist for evaluation will probably identify what kind of mass this is.
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