You should plan on forced exercise for your boy. We do at least 2 times daily of 15 minutes moving, lunging both directions. 3 times lunging spaced out is better, but you may not have enough time for that. Mostly walk, but just moving all that time Use a watch or timing device to get in the full 15 minutes. Then we gently drizzle water over his open area, down his legs to remove any drainage, scabs. Not cleaning off lower drainage will make hIm lose hair. GENTLE water flow, you don’t want to open everything by force of water pressure. His moving should keep his wound hole open, draining, prevent blockage and infection. No medication on it. I have used SWAT to keep bugs away on his inner legs, if you have insects still.
We do this for a full week to insure he is healing, checking things on him, lunging him twice a day. I do turn them out in a small paddock, grassy if possible on the third day. But not keeping a close eye on him and his wound, for the entire week, is asking for trouble. I hear about LOTS of new geldings needing the Vet again shortly after gelding, because they are swollen, closed, infections started, no drainage happening. All can be avoided with keeping an eye on him, forcing movement regularly. Not LOTS of movement as turned into big fields, other horses chasing him, result in. This is where you “have to be a bit mean”, for his good healing. Too much sympathy for his pain, not making him move enough, wIll hurt him.
I go to once a day hosing, checking for swelling, drainage to clean off, during the second week. With no issues developing, he can probably get turned out like normal now. I still force him to exercise once a day this second week. If he is older, full yearling or even more mature, he will need regular checking longer. Bigger horses need bigger holes for gelding, take longer to fully heal closed. We had a big yearling who was not fully healed in SIX weeks! Still spotting blood now and then. I called the Vet who told me that horse needed a very large hole to get the testicles out. It was just going to take longer to close up. Horse never was swollen, acted fine, did eventually close up, quit spotting blood.
Better to take the time making him move, gently washing him down after exercise, type care ”‹”‹”‹”‹ from the start, than needing to get your Vet involved a second time. Those visits are nasty. All our colts, stallions, have been handled as described above, never had a moments trouble with them healing clean. Ours are stalled nights, not left out in the cold or wet, if not being exercised. Their resistance to sickness is low after gelding. Don’t want to stress them too much at once.