Having spent more of his conscious existence in the guise of a ghost than a human, so now that he has regained a physical body, it is difficult for him to get used to it. Doorways, furniture corners, and other minor things that Morro ignored when he was a ghost have now become the main reason why bruises and small cuts appear on Morro's body. Morro is not used to pain (maybe only emotional), and now it is very difficult for him to cope with it with his low pain threshold.

...

"How did you manage to cut yourself so deeply... Not even touching anything??"

You ask this while treating a rather deep cut on Morro's arm, which was quite problematic to treat yourself. That's why he let you fix him up. Although before that you begged him to let you help him.

It's hard for Morro to understand you. You're the only one on the team who wasn't suspicious of him. He thought you were too sincere.