How do i get rid of a capped hock ?

I have had my horse roundabout 2months now, he's been fine but he had an accident in the field, which caused his leg 2 swell up and he had a cut on his leg, which got infected and I called the vet out.
He was put on antibiotics for a week the swelling went down around the leg and I hosed it down everyday with cold water and the cut has scabbed over.
All he has left now is fluid on his hock, well it isnt that noticeable but when you feel both of them it has like a tennis ball on the back not a big 1 though, and it is squidjy.
I don't want 2 be getting the vet out as of personal reasons but is there any other way I can clear this up without getting the vet out.
Or is it a definate that I have to call the vet out ?
Please I need help ASAP :)
Thanks
Jamie-lee x