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Thank you for the picture. How long have you noticed it? Is it growing rapidly? Are we spayed?
If it has been 2 years and has not progressed a lot more than this, this is a good sign as far as being more of a potential benign mass. The typical more aggressive tumors will grow and spread much more rapidly in the course of 2 years in my experience. However I am going to recommend to have this surgically removed, the fact it is on the lower side of the body, it will have a lot of contact with the surfaces as we get up and get down. When this occurs we will slowly run the risk of it getting cut, scratched, opened up. When this occurs it can get infected and then we may start to lick at it. This can just cause a lot of other problems for her to deal with then as far as some bleeding, infection and itch. Do you have a regular veterinarian you could discuss removing the mass with?
This I feel will be the the very best option for you. In the meantime if for any reason it does start to leak any fluid from the surface, keep it cleaned off daily, like with hydrogen peroxide. This will help to prevent any infection on the mass or the surrounding skin.