Is my dwarf gourami fish sick?

[Kristakj78]

I have a dwarf gourami that got injured by one of my serpae tetras. It turned white right away. It has been roughly a week now, and the "injury" on it's side has doubled in size. The fish doesn't exhibit any other noticable issues, and the rest of the tank is healthy. My concern is that it is infected now and could effect the rest of the fish? What should I do? I also have shrimp in the tank that make it hard to medicate the fish (since many meds are toxic to the shrimp). So, do you think this is "normal" healing, or should I be concerned?