I believe this is a buck my son shot last year with his bow, shot was high and no recovery. I found his sheds in late winter so I know he survived. Upon closer inspection of the picture, I noticed a triangular shape mark right about the area where his arrow penetrated. The shot was a pass through and he was shooting Thunderheads. What do you guys think, is this a healed up broad head wound or just a some other mark on the deer?

Thanks and have a good day.