Hi Mate, go to a doctor! Sometimes those cuts often look like they are infected but its just the normal healing process which looks kind of scary when you still go into the water a lot and the saltwater opens the wound everytime. I also had a cut where a little piece of coral still was sticking in and doc needed to open it again

BUT: i have lots of friends having a staph infection back in Hawaii, even the water is so nice and clear there you can get it...you find this bacteria a lot in the water, especially on river mouths or near harbours. My friends always told me to watch my cuts and go immediatly to the doctor when i see pus. When its treated early with antibiotics its not a big deal...its just gets nasty when u dont do anything. I dont wanna say you have it, but just make shure...
Reef cuts on feet, knees, and hips are really bad, i really really take care of them as much as i can because they can mean weeks of no kiting, and noone wants that. Hope u will be good soon!!!!
i posted a pic of one of my typical reef cuts on my knee, at first it looked ok, then this hole thing started because i went on kiting, after a week i saw the pus, it got red around it, then i went to the doctor and got antibiotics. for kiting i taped it...same as my food as you can see. It doesnt look that bad but like i said, even small stuff can turn bad. Hawaii has so many corals and reefs everywhere...my legs are covered withs scars from hitting the reef in nice and shallow flatwater