Likely a valve cover gasket. Not a big deal. If you decide to diy, you may find that the gasket between the front timing cover protrudes a little above the valve cover mating surface. THIS IS NORMAL, DO NOT PICK AT IT OR TRY TO REMOVE!!!!! Ask me how I know. When I did mine I thought it was part of the valve cover gasket, I picked at it until it came out, and ended up replacing the timing cover gaskets as well. A royal PITA.

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Dave

'05 325xi
'10 E70 35d
'85 911 Carrera
'66 911 Work in progress
'91 Chevy C1500
'95 Jeep Cherokee
‘18 Jeep JLU