Fish have pits in their face that help them sense their surroundings. Sort of related to the lateral line. Sometimes these become infected and begin to deteriorate, leaving larger pits and open areas. This is referred to as head and lateral line erosion. This doesn't look severe enough to be erosion, but I would keep an eye on them to make sure they don't get larger. HITH can be caused by stress, poor water quality, and hexamita.
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