Disease or injury? White line on damsel

[cocodonovan]

I just noticed this white mark across my damsel's face. Looks like the scales are kind of peeling off. Other than that he's eating and active. Does anyone know what this is or what I should do? Thanks


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[Sniperhank]

Sounds like HLLE, though I've never personally seen it on a damsel.

 

[PB_Smith]

does it look indented/sunken in? If so it could be HLLE, but as Sniper said, rare to see in damsels. If it is HLLE you should have noticed it before it got that far. How quickly did this come up?
It also looks like damage to the scales. Is there anything in the tank that may have attacked it, another fish, crab, brittle star...?