As a judge and showman, show him. Scars shouldn't affect his placing. I will say that if they are noticeable in areas like knees or hocks, I will watch every step that horse makes much more closely to be sure it doesn't affect soundness. There are also several things you can use to cover them up and make them less noticeable.
As far as the showing side, this happened last summer. One of my students loves my big gray broodmare and wanted to halter her at her 4-H fair to accumulate more points towards the high point award. They hauled her, but tied her in the trailer...I never tie...forgot to UN-TIE her before they asked her to back out. When she did as asked and hit tension she flipped her head up and scraped a 3 inch chunk off the side of her cheek. Just peeled hair and small bit of skin (nothing major, but she was bloody) I spoke to the judge and let him know what happened and she showed her anyway. We packed her with vaseline like a boxer to keep the bleeding to a minimum....end of story, she stood Grand Champion western mare, bloody face and all, then repeated 2 days later as Grand Champion hunter mare with her fresh scrape. So by all means, don't let a scar dissuade you from showing!
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