White spot on purple tang

I would agree with your assessment. Doesn't look like ich or flukes. Looks like he was looking in or at something he shouldn't have
 
Is it raised up in anyway? My first thought is lymphocystis but I have only see it on or near the mouth of fish in disease books, typically it's on the body or fins or both. Caused by stress, has anything changed in the tank recently?
 
Nothing has really changed. I removed another fish with a fish trap over a week ago.

It doesn't really appear to be raised at all.
 
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