Does any of the other snakes that were in the care of the person you loaned it to has these spots? It they are just a discoloration then I would just keep an eye on them to see if they increase in size. I would keep it on paper towels like I see in your pics. This will help you in detecting any kind of bugs or bleeding! If they do get worse or look like they are bothering the snake(like not eating) then I would take it to a qualified reptile vet for a check up! Wish you the best of luck!