I don't think its anything to worry about Tiger ^_^ You take excellent care of your snakes so he should be fine. Though maybe if you want to make sure then maybe soak him for a few minutes in some warm water? I heard some people talk about soaking snakes with skin/scale injuries to help healing. But I don't think he really needs it ^_^ Sounds to me like part of his scale just came off is all. I assume he injured that particular scale earlier and it just came off with the shed. I bet it will clear up in a shed or two!

Or I could be totally wrong... T_T