Yes, ozone would work great. The ozone can be applied by cupping.
How does cupping work?
Cupping involves covering the area to be ozonated with a cup that the ozone is blown in to to localize the ozone to that area. A simple way to do this is to take a small plastic cup large enough to fit over the area. Drill a hole in the end large enough to fit the ozone tube in to. Place the cup over the area and turn on the ozone generator and hold the cup in place loosely to allow prevent too much pressure build up inside the cup.
Another option is to take a raw potato, grate some of the potato and pack it over the infection for several hours. The raw potato will help draw the infection out.
How do we treat it after the infection is drawn out?
Keep treating it with the ozone. If it starts to build up again inside the pore he may need to poke it with a pin to release the pressure.
3. Could he be able to do something to prevent this from happening?
It depends on why it is happening.
It's the pore that got plugged by trapping bacteria.
If it keeps happening over and over with the same pore then the doctor may need to open the pore surgically and leave it laid open so it can drain.