Sorry, I know nothing about quail, but I'll give advice that I do for my injured chickens.
First, make a Saline rinse. Boil two cups of water and add a teaspoon of salt. Let completely cool (can put in fridge or freezer to cool it faster) before use. Gently pour it on wounds to clean. Repeat cleaning 2-3 times a day. For first cleaning, you can use Hydrogen Peroxide (a spray would be great if you have it), but only for that first cleaning and no further cleanings unless absolutely necessary.
After cleaned, apply an ointment such a Bag Balm, Neosporin (without pain relief as many people suggest), or another poultry safe ointment if you have it.
Keep him separated in a clean space with fresh clean water and food until he's healed. Adding electrolytes to his water also might prove to be helpful. Make sure he's staying active enough so that he's not in shock or anything. Expect to see random green spots on his injured skin (that don't stink); those are bruises.
Again, that is chicken care, as I don't know much about quail.