Can anyone tell me what this is, and if there is a gasket that gets replaced there? Over time a small amount of oil gets in this location and it's not from my valve cover gasket. Right under the fuel rail. Any help is appreciated.

 

It looks like maybe a Header gasket? If say clean the area off, drive it for a while and maybe then you can have a better idea of where it's coming from

 

Doesn't seem like a spot oil should come through.