Red spots on my axolotl?

[Laurenj521]

My axolotl is about 6 years old and he’s in a low boy tank with a female. I’ve never had a problem with either one of them. Ammonia is 0ppm, nitrite 0ppm, nitrate 25-30ppm. I do weekly vacuums with seachem prime. Nothing new. What are these red spots???

 

[wolfen]

the red spots look like abrasions with the ones on the tail looking like a bite.