You didn't say whether you changed your own oil.
If you do, you'll see that a small amount harmlessly spills onto the axle. That's normal.
If you let someone else change your oil, a bit will spill and look like a leak (to you).
If the filter isn't tightened or it's double gasketed it'll drip. So clean it off with a degreaser and see that the filter is tightened. Look for new leaks.
If you clean it, you'll see where it is leaking from. Most anything else is a guess.