The man was speaking as if he'd never had skin before, much less seen bodily fluids or oil from the skin. McCoy would normally have been surprised by the complaints, except he'd had those encounters with the admiral and that other man to dampen the surprise by now. McCoy frowned at him anyway. Compared to other lifeforms, human epidermal tissue wasn't exactly perfect, but there wasn't anything terrible with just being human either.

"There's nothing wrong with how human bodies are made up." Maybe not perfection, but that was the beauty of it. Humans were flawed and that made them different. It helped them avoid stagnation, grow and adapt, mke amazing discoveries and blunders.

It took him a moment to figure out what the man was getting at. McCoy resisted the urge to to stop him, but could only watch warily as the patient worked at his fingernails, wondering if he was going to try and rip them off right in front of him. He never thought the day would come when he'd have to explain fingernails to someone. Most humanoids had them, or at least, some variation of them. There was a first time for everything, he supposed.

"Those aren't armor plating," McCoy said gruffly. "They're fingernails. Keratin. I can tell you they aren't useless, so stop tryin' to pry them off." Even if an injury like that was easily repaired back home, it didn't make it any less painful to go through in the first place. If this man really was an alien transplanted into a human body, he was going to be in for a surprise if he kept it up.

If that was the case, someone had to set him right about a few things before he hurt himself in this body.

"I take it you're new to all this."