Took in the Prius C (2014) for an oil change at 120k miles and they took this pics and said something about a timing cover maybe leaking? I had a Krown treatment back in September and I doubt the oil would still be oily this many months later but could that be it?
Looks like a leaky timing cover. These cars do get small weeps there, yours is leaking more than most I've seen. In the short term, I would recommend dipstick vigilance to make sure you aren't leaking so much as to create a lubrication shortage. Wash off what's leaked and see how long it takes to grow back.