seroma - steroid injection

Hi I am three weeks post op diep flap and lymph node transfer I have been left with a large lower abdomin seroma which in the last 6 days has had over 2 liters drained from it this is after drains were removed day 5 the area of fluid build up is around groin area where lymph nodes were removed , I have has a steriod injection given to the area after my last hospital visit has any one else recived this treatment 

Thanks Lisa