Passenger side engine bay

So I have a 2015 Lexus nx 200t f sport. I'm the original owner, it has 165k on the odometer. I've done all of the maintenence myself after 30k miles and the car has served me well. I just did another oil change and the oil is fine but I noticed that I got this area of oil which looks like it's leaking from a gasket. Anyone deal with this before? Also does anyone have a part number to this gasket? Must be very slow leak because my oil is never low.