I don't have silkies and don't know how in the world people sex them. I do have roosters. That looks like a comb injury from fighting. You did right to seperate them.
Clean it gently and take pictures of the injury. Apply some antibiotic salve. The kind without pain relievers in it. Put some electrolytes in water (you can find these at tractor supply) and also offer fresh water. Alternatively, you can give him some Nutri-drench, also found at Tractor Supply.
Monitor to make sure he is eating, drinking, and pooping.
Best of luck!
Clean it gently and take pictures of the injury. Apply some antibiotic salve. The kind without pain relievers in it. Put some electrolytes in water (you can find these at tractor supply) and also offer fresh water. Alternatively, you can give him some Nutri-drench, also found at Tractor Supply.
Monitor to make sure he is eating, drinking, and pooping.
Best of luck!