Help! What is this on my blenny

[bossman818]

What is this on my cardinal blenny? One of the fins look damaged and some type of scaring or something. He scrapes against back wall often. What can I do? I am somewhat new to hobby and never dealt with this. Any help will be appreciated. Photos is after I fed him.

 

[fishguy242]

#fishmedic

 

[Jekyl]

Can you please post white light pics? Could be aggression from another tank mate

 

[Jay Hemdal]

Tough to see clearly, posting under white lights will help, but that could be lymphocystis, a self-limiting viral disease that doesn't require treatment.

 

[Sharkbait19]

As stated white light pics would help.
I know my fang blenny was the object of aggression from some tankmates, they can be quite docile and an easy target.