Oil around the cam/cylinder head covers is fairly common, the cover gasket starts to leak after about that time, and is a fairly easy fix. I'm not sure if you mean the cylinder head covers on top of the engine or the timing belt covers at the front. If its the timing belt covers, the cam gear seals can also be the issue, which require removal of the timing belt and is a bit more involved of a job.
Oil around the oil pan could also be the gasket, and also isn't very difficult. I don't think it could be due to an oil change, because spillage there usually goes into the spark plug wells. If its at the front of the engine, it could also be the main crankshaft seal, which also requires removal of the timing belt.
I would check to see if the timing belt has been changed, its the major maintenance item at about 100k miles. I did mine last year and changed all the seals/gaskets above for good measure. Cost about $500 in parts and a couple days worth of labor.
Last edited by saadcee; 03-01-16 at 11:50 AM.