Oil drain plug leak

I also had the same problem because I change the oil myself but the solution is quite simple. I use a layer of Teflon in drain plug before tightening it in its place. The Teflon serves great to stop leakage. Of course, this is true if we suppose your drain plug and your oil pan threads don't have any problems. So, Teflon Tape was the right solution for me. I used to tighten drain plug without using any Teflon or copper washer. This can also prevent leakage but tightening the plug without Teflon or washer can damage threads.

Don't over-tighten the plug, you can strip the threads in the sump. That'd increase the drip, make a larger mess, and result in a more complicated repair.

If you do drain the oil to remove and inspect the plug, and if there's a gasket under the plug head, replace the gasket.