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Not sure I had a single dot like that on my yellow tang he was in qt for a month or better and now he's been in my dt for a month and it never changed..... And that's way past the cycle of ick so I'm guessing my tang will be fine I'd qt the angel for at least a couple of weeks to see if it changes.... And even in qt you will still enjoy him or her and the month will fly by a qt is worth it.....
I would get a qt even if it's a 10 gallon my lfs sells 10gallon tanks with filter an heater for 20 bucks well worth looking into sooner you get the angel out the better