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Hello, I am Dr. RB and I am a licensed veterinarian. Fatty tumors (called lipomas) are often soft masses that are freely moveable and not attached to the underlying tissue. Firm masses are of a little more of a concern as some firm mass are malignant and locally invasive. A mass that is very thin walled and obviously full of fluid is either a seroma or an abscess. Honestly, I would not recommend attempting to aspirate or drain this mass yourself as this could introduce infection if not done sterilely. If the mass is large enough for it to stretch the skin beyond its capacity, it does have the potential to rupture. I would recommend calling local veterinarians around you and explaining this situation. An appointment to drain and treat a mass would be much less costly than the cost of surgery if this mass were to rupture. I hope this helps you..
Hello again;) If it is freely moveable, doesn't appear red or inflamed, isn't found in an area that she is bothering her when she walks or can traumatize it, I would continue to watch it for any changes in size, color or appearance. If there is fluid found within the mass, most veterinarian could see examine it and provide treatment for 100-300 dollars (depending on your location) unless surgical removal would be warranted (due to amount of free space that will be present after draining the mass and its likelihood to re-occur) then the cost would increase.
Hello again, I hope your little friend is feeling better..If my advice helped, it would be greatly appreciated if you could take the time to give my response a positive rating? This would allow me to receive compensation for my expertise and time assisting you and your pet.. Much thanks