Looks to me not like mites, but like something larger is biting your dragon.
Which insects do you feed? Any chance there are insects free in the enclosure, biting the dragon when resting/ at night? Crickets are known for doing so.
Mites are, as Chris. mentioned, small, black (or brown/ tan) and moving, and they don't leave wounds like that. Dragons tend to scratch when there are mites, but the wounds from that are also looking different usually (elongated scratch "cuts").