Swallen face

My face is terribly swallen at the moment since I've got a surgery on my teeh last Friday.
I think people might think I was hitted by someone.
Especially my lips are also damaged and they really look like hitted damaged lips.

So I wear some mask to hide my face.
here Japaen we wear a mask often when we catch a cold or we had alegy for herbs.
Recently I have been asked people from other country that why Japaense wear masks when they get cold.
Actually I also do not know.
I guess we try not to scatter the germ to others.