My clownfish has this white spot

[newreefer38]

I recently added a tang and now my clown has a huge white patch on 1 side. She is about 18 and from the wild.

 

[vetteguy53081]

I recently added a tang and now my clown has a huge white patch on 1 side. She is about 18 and from the wild.

Looks like a rash or scrape injury but to fully confirm, please repost pic under white light intensity as pics are dark

 

[Jay Hemdal]

I recently added a tang and now my clown has a huge white patch on 1 side. She is about 18 and from the wild.

Welcome to Reef2Reef!

Have you had the clown for that long, or did you get it from somebody else?
Since the issue is on just one side, that typically indicates an injury, not a disease.
Posting video/pictures under white light will help us see better.

Jay