Oil Leak

While making a small drive I noticed an oil smell. I thought it was the gasket on the valve cover but in looking it seems to be coming out of a different area. 1992 Caravan
There is a round plastic, like plug. It seems to be leaking around this spot. Is there something I can do to fix this? Is it an easy part to replace or is it a garage job?::banghead:

does the plug have any wires coming out of it? is it the oil pressure sensor?

No no wires coming out of it. It is about in the middle of the block on the right hand side facing the engine. Seems to be a plastic. Thought it would be a frost plug?