Axillary breast tissue removal post op complications?

I had my right axillary breast tissue removed on 8/17. I developed a large accumlation of fluid (half a golf ball size) under my armpit afterwards. I'm using a compression garmet along with wrapping it. The fluid was asperated a week after surgery due to pain and now its back again. Will this go away eventually? Is this fluid normal? I'm not sure if I should be concerned.