2002 RX 300 - oil drip

[Dave_02RX300]

I'm not sure where this slight drip comes from.  It looks like something in the power train, where the axle comes out of.  If I can get the name of this area, maybe I can google what kind of leak or drip this is, to better understand the severity.  It took 4 weeks to make this drip spot on the floor (the car was garaged while on vacation).  Last oil change was about a year ago, and 1500 miles.  And the oil is still tip top on the level.

Tell me the best, or tell me the worst.
Thanks

[RX400h]

An auto shop can add a UV dye to your oil and then later check to see from where it is originating, especially if it is not obvious from the top or bottom of the engine..