Do you feed live rodents? If so, it could be bite wounds- rodents object to being dinner, & even if they don't win the battle, they fight back as best they can.
It might also be just a wound from something sharp (like a branch?) in his cage- it's hard to say for sure. Best wound care for snakes is Vetericyn ointment, as it's water-based (not petroleum based like ointments made for humans), but in a pinch you can dab on some Betadine solution (povidone-iodine), or a tiny bit of Neosporin ointment (just NEVER the pain relief version). It looks mostly healed anyway, hard to tell though.
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