As you can see, he has a fairly large sized bruise that covers a good ¼ of his face from getting clocked by an Azgeda warrior during his mission in 4x02.
This is the beautiful Clarke Griffin:
Her mother was a doctor on the Ark and still is one on the Ground, and has no doubt taught her daughter basic first aid. She also has had a lot of experience dealing with injuries because of the many her friends have sustained throughout the entire story. She is, in conclusion, reasonably capable of tending to other people’s injuries.
It is already canon that the two have a deep love for each other (whether you’d like to view it as romantic or platonic, it is there, it’s romantic btw). They have already shown concern over each others’ injuries before this point in time (ex: the hand wrapping in 3x11).
In other words
IF THIS NEXT EPISODE DOESN’T HAVE CLARKE LOOKING AT BELLAMY’S INJURED FACE WITH CONCERN AND HAVE HER GENTLY PLACING HER HAND ON WHERE HE WAS HIT AND LOOK LOVINGLY INTO HIS EYES WHILE ASKING IF HE IS OK I WILL LITERALLY PROTEST AT CW HEADQUARTERS
