Lesion on clownfish?? Please help diagnose!

[spiffyreefer]

Yesterday I noticed my black ice clownfish had some sort of lesion on his head. In blue light it looks gray and in white light it looks pinkish. Based on my research, it looks like it could be some kind of bacterial infection, but I could be totally incorrect. It's hard to say because he is mostly white, but I do not see any other spots or anything on the rest of his body. I've had him for nearly two months and he seems okay otherwise (not breathing fast, swimming, eating). It is possible that he may have actually had this for a while, I recall noticing a faint grayish spot before, but at the time could not tell if it was problematic. The other clownfish and watchman goby in the tank appear totally normally. The only thing that has changed in the tank recently is that I added two trochus snails from a LFS (about 3 weeks ago). I attached a few photos (sorry for poor quality) that show the spot on his head.

Any thoughts on a diagnosis and how to treat??

 

[Auquanut]

Can't really tell from the photos. Is it raised? Could it be an abrasion?

 

[Uncle99]

Yup, I see what you see, like an abrasion, but does not look recent.
Looks like a bite mark that has healed, but of course, that’s just a SWAG.
My rule is NOT to treat unless I am very sure what I am treating.
Other than this slight discoloration, if there are no behavioral changes, do nothing but watch.

 

[spiffyreefer]

Thanks all. The fish has not been treated with anything since he arrived. The spot is not raised, it is flat. It does not look like an open wound or ulcer, more like a lesion/abrasion. I haven't been able to get a close up yet. I think it is possible that it's a bite mark. This clownfish has been housed with another clown (I ordered them together as juveniles and they've lived together the whole time). I presume the injured clown is male and the other is female due to size difference and the behavior I've observed between the two. I did see the female bite the injured male clown earlier today, making me think that it could be a bite mark. She has bitten his fins in the past. I haven't removed him from the tank yet, I'm sort of watching the injury to see if it looks worse or better (so far no real change), but I set up a QT tank so that I'm ready to move him immediately if I need to. Now I'm thinking that maybe I should separate my clownfish into my two different tanks...I don't want anything more serious to happen...

 

[Auquanut]

Sounds to me like you're doing all the right things. Having the QT standing by is a good idea. Clowns are pretty resilient, and with any luck he will heal quickly. Hopefully they can work out their differences and live happily ever after, but it's good that you have a place for the little guy to go if they just can't get along.