She had indeed seen a man's body, but that was only his upper body. And when she remembered that she had to take care of all parts of his body, she was really nervous because she had to take care of his lower body too.
"K-keiran, can you take off your pants!! I'll treat the wound on your lower body." Having to do something embarrassing for her, made her mind go round and round. Not wanting Keiran to find her request strange, she immediately forced Keiran to open his pants.
"You don't have to push yourself if you don't want to, I can ask Rufus to take care of it." Seeing Alicia nervous, Keiran knew that she actually didn't have the courage to do that and forced herself because of her responsibility as a healer. He knew it was because she was a shy girl.
But on the other hand Alicia actually thought Him's solution was very strange, she was really nervous when she found out that Keiran would call Rufus to replace Alicia.