Wounds on legs

Hi my horse before I bought him nicked his back leg and it is sort of healing up but I thought I would just ask anyway the scab has now goten smaller and I have been spraying it with centrigen any thoughts

How did he get hurt?

If the scab is getting smaller usually that means it's healing good and should be fully healed in a short time.

I wouldn't be too worried. If you do get worried just get a vets opinion. But by the sounds of it, it seems like it's healing fine.