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Hello, this is Dr. Jess. I am sorry to hear about your kitty! Does this mass feel soft or fluid filled? Or is it firmer?
It sounds like it could be a cystic mass. These can be fluid filled and sometimes break open or bleed. Many are benign in the sense that they don't necessarily spread elsewhere on the body, but sometimes can cause problems if they get large or get infected. The only way to say for certain if one may be a more concerning cancer, though, would be to do an aspirate of the mass to look at under the microscope. This can usually be done without any sedation needed, using a needle the same size as you would use for vaccines. I would recommend having your kitty examined by a vet to see if they feel it is a mass that needs to be investigated further. Hopefully it is just a benign cyst that won't cause any problems, but it is better to be safe and get it looked at. In the meantime, I would apply neosporin/triple antibiotic ointment to the area if there is bleeding present. Sometimes applying a warm compress if there is any other discharge present will aid in drainage as well.
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