Oil build up on chain

Hi all,
No matter how or what I adjust I cannot prevent a buid of oil on one side of my chain (of course the other side is shiny), so it seems my chain must be rubbing somewhere on the drivetrain and therefore unwanted wear is taking place, but I fail to visibly see where. The bike is a PlanetX XLS Carbon flatbar running a complete Shimano Tiagra set up with a KMC X10 chain and gear changing appears good. HELP !!!
No matter how or what I adjust I cannot prevent a buid of oil on one side of my chain (of course the other side is shiny), so it seems my chain must be rubbing somewhere on the drivetrain and therefore unwanted wear is taking place, but I fail to visibly see where. The bike is a PlanetX XLS Carbon flatbar running a complete Shimano Tiagra set up with a KMC X10 chain and gear changing appears good. HELP !!!
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