I get the injections because the cyst never comes to a head and I just don't want it hanging out on my face for the world to see.
It just kills the bacteria that's deep down in the pore that no topical could get to. It's nice to know that within a day, the thing is gone.
I'm not sure if physicians do this, and I've been told a lot of derms don't either. Your best bet would be to call around and see if any do perform this procedure.