My leak drips off the rear of the pan, too. Took a pic of the area while doing my brakes, with motor off, and this is what it looks like. The image on the right is of another Camry with oil pump seal leak. Lots of oil caked up around the area. I'm hoping the area that looks clean is because that's where the stream of oil drips down, and keeps it clean? 1 drip every second at idle. 227k miles

 

The photo of the leaking pump is representative of what happens with the seal starts to fail. This oil is under pressure causing a steady drip and will stop when the engine is turned off.

Your issue could be a bad valve cover seal. The oil is not under pressure but leaks out slowly and moves down the back and side of the engine.

It happens the cam or crankshaft seal will start to leak but here the oil debris would be under the cover.

Try retorquing the 4 large nuts that hold the valve cover down.

 

Hmm... I'm going to clean up down there and look at it while it's running. Because it doesn't leak while parked only constant dripping while running. My photo on the left, you see the clean part and the oil caked up on the sides. Looks clean because that's where the oil is running at. Like the photo of someone elses on the right. (Oil pump / pump shaft seal.)

 

There are dyes that can be put into the oil which will glow under UV light.

Clean the engine where the oil is as best you can.

Start engine and watch where the oil comes from. If the oil pump is leaking, oil will come out from under the cover.

 

do u have photo of it