You can use plain Neosporin, if you have that. Or any brand triple antibiotic ointment…. without pain relief. I buy (4) packs on Amazon and stay stocked up. I hope this helps. 🙂
It does look like a rub. It’s never happened with my bunnies, but it looked like that when my Guinea pig rubbed her nose on the wire of her cage once. I just cleaned it, applied an antibiotic, and it healed fine.