Help!! Stain on leather jacket

So I noticed a dark streak on the back my Aero Bronco A2 jacket the other day. It wasn't too noticeable so I left it cause i wasn't sure what caused it or what it was. It was about a half inch wide and 2 or 3 inches long. It was bugging me so zi got a cloth and rubbed it a bit and thought it was

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Help!! Stain on leather jacket

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