Any idea what this could be from?  Interested in the horse.  Hes at a feedlot and rode around bareback quietly

Who owns the horse? I would ask them what these scars are from. Are they only riding this horse bareback because a saddle hurts or can he be rode in a saddle too? 

I'm pretty sure they mean the slaughter feedlot. I doubt anyone knows anything 

It may not be but I once saw a horse with HERDA which is a disease that lets the skin detach from the underneath......which could cause scars like this if they were open and healed. Rub the horses skin and see if it seem "loose". 

Yes feedlot as in slaughter bound feedlot.  He was ridden bareback as thats how they ride ALL the incoming horses, bareback in a rope halter.  I couldn't put my hands on him before purchase.  Hes a green 3 yro and didn't come in with any papers.  

Aww ok, When someone says feedlot in my part of the country we are talking cattle feed lot's. And I was thinking why would the Cowboys be riding this horse bareback, so glad you cleared this up for me. Since this is a sale barn/yard you will never know what happen to this horse, they took him to this sale barn/yard for a reason. He looks to be in good flesh so I think the scars will always be a mystery..He could have got caught up in a stock, or rolled into a fence and panicked, ran under something or was in a trailer accident. Years ago a friends horse tryed to run under a gooseneck trailers hitch and its didnt end very well. 

Barbed wire.  I have one just like that on my leg where a colt brushed me against a fence.  He probably tried to walk under a single wire and got hooked.   Very slow to heal.