No way are you causing him pain... Confused by that comment.
Also doesn't really make sense that he would have a perfect saddle shaped scar. Not sure how that would happen. (Scars are also usually hairless or something not a different color like that).
I agree, how long have you had him? What is his lifestyle (turnout/diet)? Also, where do you live that you can be hosing in the winter? Lol