Ich or not

[Bartman]

About 2 weeks ago my Royal Gramma suddenly had a few grains of "salt" stuck to her side and tail fins. I was going to ask the forum whether it was possible for a 4 year old fish in a tank that has never had a disease and has had nothing added lately to get Ich but....the next day the spots were mostly gone. Now, yesterday evening I noticed she had some spots on her head and mouth and in her tail fin. Today they are gone again. This doesn't seem like Ich and the fish acts and eats normally so I'm not sure I should even be concerned. Any idea what it might be?