I made a huge long post but my internet died when i tried to send it so here is the short version. My purple tang had iche but not the spots like you described. I put him in quarantine for 3 weeks with copper and prazi after quarantine he had those spots so i dont think it is a parasite. I think it is either from stess or maybe not enough algea the spots are going away on mine now after putting it back in my tank. This is just my observation so it might be right or it could be wrong.
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