Clownfish help!

[DQM Coral Fish]

hi guys.
I just bought a frostbite clown fish and my black clown-fish took a chuck of my frostbite in his or her face!! I am worried that this may lead to infection. Can any experience reefer or any fish hobbyist can help me out. i have 2 pictures. Can anyone help me out. What are the steps I should take? what is the best medication please. Thank you

 

[CoralsAddiction]

Maracyn 2 if you can find it. If not, Furan 2 will help also.

 

[CoralsAddiction]

Did you actually see your clown bite the new clown and cause this injury? Sometimes clowns will get injury like that when they get stung by a coral or anemone.