Looks like the oil seal is letting go. I think it's PN 93101-38098-00. If you're handy with tools, shouldn't take to long to change out. If not, take it to your mechanic. Don't wait to long to baveit looked at though.
My bad, part 33 pn 93108-43014-00 but if oil is coming out of this one there's a possibility that item 13 is shot also. Since you have to tear the rear apart to get to them, might as well do a complete seal job once you're there.