I had a long lasting, persistent seroma that refilled repeatedly. It wasn’t painful, but inhibited my getting a proper prosthesis for months and I could have lived without the sloshing when I bent over! I even got babushka seromas, one inside the other. But massage helped, my lymphoedema therapist started a bit later than ideal, but little by little she reduced it. My surgery was pain free and healed rapidly without any movement limitations so no, I don’t think it’s bad surgery. It is important to get rid of it though, the fluid build up is like Christmas for bad bacteria (we all have some in our bodies) and can cause infections. Best wishes.