check to make sure it isn't sand/debris, if it is fungus go to Axolotls - Requirements & Water Conditions in Captivity and look into using holtfreters solution or modified solution, axolotls come from slight brackish high mineral environment, although lots of axolotls are more than happy in freshwater some become susceptible to fungus issues due to a lack of salt and minerals in the water.
Since the gill feathers look otherwise healthy, check also if these white spots on gills could be normal iridophores
(although it doesn't look like a typical golden albino)
Of course, I could be wrong
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