Wounds like that often don't scar which is nice, foals seem to be accidents waiting to happen.
All puncture wounds you want to leave open, not suture because they need to heal from the inside out. You do need to keep them open, as you did with scrubbing and flushing, otherwise the top heals and infection often developes inside.
You've got that right about foals. Hope had another boo-boo about the same time as the one on her head. She cut her right front ankle almost to the bone on an old piece of tin. I had it stitched, but it got infected anyway. There was alot of deep mud around the barn and there was just no way to keep it clean, even with a bandage, so the stitches ended up pulling out. The cut was about as long as my index finger and got about as wide with proud flesh. The vet told me to use Granulex on it and it worked really well too. The proud flesh went away and there's no scar there either. Poor baby, if she hadn't been an imprinted foal I don't know how I would've gotten it all doctored. She didn't like it, but she let me do it without a fuss. I just tied her to a barn post next to her mom and she'd stand there and let me work on her. She always got a little handfull of feed when we were done as her treat.