Spot on side and torn fin?

[Reflective]

Hi,
I have a fish in quarantine which I noticed today has a little grey spot on one side and one of its pelvic? fins looks like bone or something sticking out.
I have some dry rock in the quarantine tank and he mostly hides upside down in one of the crevices and "crawling" underneath it. So I'm not sure if he just banged himself up on the rock or if it's something else.
Here are the best pics I could get:
Fin -

Side Spot -

 

[Oscaror]

could be something, I'm not very knowledgeable on the subject. But maybe someone on the [HASHTAG]#reefsquad[/HASHTAG] is

 

[FL_Reefer]

Looks to me that he may have scrapped up against the rock in there while trying to hide

 

[Reflective]

Thanks!

 

[Humblefish]

Looks to me that he may have scrapped up against the rock in there while trying to hide

^^This would be my guess as well. I would just keep an eye on it for now and watch for signs of infection (i.e. it will grow in size/look worse.)