Whats on my fish?

[Gregpetro]

On my tail spot blemmy I noticed 3 white marks a day or 2 agao. All my fish are health. The blemmy is eating and acting normal no flashing just doing his normal thing. I have attached a few pics there not great. The spots don't seem to be raised but they seem flat. Also there not circular and are only in that one spot. I have dealt with ich in the past **not this tank.** and all my fish were quartined with meds for 20 days prior to going in a few months back. Anyone have any idea what thses spots could be? Any help would be awsome.

 

[fishguy242]

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