YMMV but bi-carb/baking soda poultices have helped me on several occasions of fluid build up. When I sprained my knee a few years ago, it filled with so much fluid that the skin was pulled so taught it was almost painful. Baking soda poultice really help draw some of the fluid out overnight.
Again, YMMV but they’re cheap and easy to make, give it a shot if it doesn’t subside 