Anthias problem, please help

I have a school of 3 carriberry anthias, ive had them for about a month and a half now and they are always all three together. I know that one of them will morph into a male so i figured thats what this one was doing becuase he hasnt been leaving the rocks lately. WHen i examined him today i noticed a dark spot on his side. It almost looks like another fish rammed his side and now he is bruised, its slightly raised also like a tiny bit of swelling. No damage to the surface of the skin, kinda looks like a blood clot or somthing underneath. Hes hiding constantly though. Anyone know whats going on with him?

 

Just a guess that is may be parasitic in nature. My other thought would be and injury from another fish. As always a picture if you can get one really helps.

 

I'm not an expert, but it does sound like something got under its skin. It could be a parasite as suggested by Coralline.
I second the picture request. A picture says more than a thousand words.

- Mag.

 

im actually trying to get a picture right now but hes bein a butthead hahaha, ill post it asap. Thanks for the quick responces

 

If you have some garlic additive for your fish food, try that. Garlic is pretty good at making shy fish hungry and willing to show up for dinner.

 

Picture

i Think this is as good as he will let me take for right now, u can see the slightly purple spot on his side.