Chico's nose appears to have been slightly rubbed raw. This can happen when dogs are rubbing their noses against a surface frequently and generally heals on its own.
I do worry that the patch of circular hair loss on his leg may be associated with a skin infection. I'd recommend taking him to see a veterinarian to have it checked. They can guide you best after a physical exam.
I hope this helps. Thanks for using Petco Pet Education Center, formerly Petcoach.