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Hello. Thanks for the question.
This is quite a frustrating situation. To be honest, I don't every re-cut or put drains in a seroma. I just have the owner use a warm compress on the area 2-3 times daily. I'll have them do that until the body reabsorbs the fluid completely. It can take anywhere from a few days to a couple weeks. Sometimes I'll stick a needle in and drain the fluid, but that's pretty rare. I have never used penrose (rubber) drains in a seroma, as they are a foreign body and can induce fluid production.
The only other thing that could be done, is placing a vacuum assisted drain. There is one called a Jackson Pratt Drain. These have suction, so it'll collect the fluid and allow the tissue to be pulled together and start to heal. I haven't had to use a JP Drain for these, but it is an option that you could discuss with your vet. I would be more inclined to just use a warm compress and let it go down on it's own.
I hope this helps, let me know if you have any other questions.