If you've had the snake for two years, and not taken in any other snakes more or less recently, and not handled any other snakes recently (at a shop or expo), I'd not suspect mites.
I'd not treat for mites -- even with ineffective products like the one in the photo -- without some evidence that there are mites or some reason to do so preventatively (as with keepers who use PAM on all new arrivals).
Troubleshooting questions:
"hasn’t eaten since 11/3/23 " -- is that within his normal feeding habits?
When did he last shed?
Is there a moist hide in the enclosure?
Is the only heat source the CHE that's above the water bowl?
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