I got one of these a few days ago, maybe even during last weekend at some point, and the other one last night. You should be able to tell from the different colourations which is the older and which is the newer, this is pretty basic bruise knowledge.
The first one might have been from accidentally punching a door knob, but as far as the second one goes, your guess is as good as mine.
Thanks to my flatmate for taking pics. And yes it is this dark in the flat so this was as good as it was going to get.