Blue Tang with faded area on head?

[xtrattitude4u]

While cleaning my tank today, I noticed our blue Tang has a faded white area on the head and extends to one of the gills.

This must have been a pretty recent development as I've never noticed this before today. I don't see any white spots anywhere, it just looks like a greyish faded shape on the head and one side, where is normally all black.

Could this be a ICH, or something else?

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[Uncle99]

Not ick
Maybe early HLLE?

 

[xtrattitude4u]

Huh, I just looked at the fish this morning and the spot is basically gone. I did kick up quite a bit of sand dust during the cleaning, and I was wondering if maybe swimming through it stained the skin?

It looked more like that area had turned sort of translucent though. Weird.

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[Uncle99]

Maybe your strong blues are just highlighting normal changes in colour.
They can display their feeling in small colour changes and these changes are enhanced in the blue spectrum.
I have a YT and a blue, both show weaker colouration in some areas from time to time.
The yellow shows patches of white visible under the blues, but, when I turn off the blues, he's back to solid yellow.