Unique Mark on Purple Tang

[Trinh Fish & Corals]

I have this unique marking on my purple tang on his top dorsal fin. Is it an aberrant marking? Stress mark? Any ideas? Thanks.

 

[Timfish]

Haed to say, it could be unique or it could be from an injury. Time will tell.

 

[Trinh Fish & Corals]

Haed to say, it could be unique or it could be from an injury. Time will tell.

he’s been like this for about 2 months now