Several possibilities. All require careful cleaning and inspection;
1) Valve cover gaskets age, harden, and begin to leak. Not a terrible job, but rear cover is hard to reach.
2) Crankshaft end seals. Only pax side engine seal is accessible w/o major surgery. Driver's side requires removing transmission, and much more.
3) oil pump cover gasket. Requires timing belt and oil pan removal; a big job.
4) Oil filter/Vtec cover fitting is readily accessible and a common leak site.
5) oil pan leak is not common but certainly possible.
Oil on oil pan is more likely from valve cover gaskets but could be oil pan itself. Careful not to strip oil drain plug. Not likely source of your oil since you have a sealing washer.
My 2008 developed a relatively large leak on the crankshaft end seal at the driver/transmission side. I was lucky it happened while the vehicle was under Acura warranty. If the plastic splash guard under the transmission is wetted by oil, then your seal is going bad. That is a major repair. Good luck and let us know.
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