Folded scales. The scales are soft enough that when your snake curls up for a while, some scales just get compressed & folded under. Pretty normal, especially on snakes whose scales aren't keeled (or thicker & tougher).
If you doubt this, just cut out some paper "scales", glue them onto your arm, & fold your elbow for a while.
Perhaps that's a new career idea for someone? "Snake groomer" -to unfold all those pesky imperfect scales.
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