Problem with Maroon clown

[jobu28]

I have a maroon clown which seemed to be hiding alot and not coming out for food. When i coaxed her out from behind the rocks i found this. Any help would be appreciated.

 

[beth]

Never ever take a fish out of water just for a picture. The risks of injury and bacterial infection is extremely high, just to net a fish, let alone lay him on something (is that towel, or carpet?).
Please describe what noticed. How long have you had this fish?

 

[jobu28]

I have had the fish for about a month. Was eating and doing great. It looks like raised areas with white bordering a hole. The hole doesnt look like it goes all the way through. It looks llike one of my other fish is developing a similar symptom. A white spot starting to make a hole? He is still feeding though.
water is
0 am
0 ni
40 nitrate
temp 78
sal 1.022

 

[beth]

Wat kind of set up do you have? I'm thinking it may be aggression, especially with another fish coming down with the same problem. Is the hole bloody, as in a wound?

 

[jobu28]

I dont think its aggresion. Its a 75g with the clown, two gobies, a marine betta, one YT damsel, a coral beauty, and a majestic angel who is the one with the wound. Never see anyone attacking or even chasing anyone. But if you are right how do i proceed. And if its not aggresion how do i proceed.

 

[jobu28]

Sorry, not bloody. A couple of days ago just looked like a raised area, then raised with a whitish outer ring, and now a hole with a whitish inside no longer raised. If that makes any sense.