This young'un had spunk! Leonard could appreciate that. "My mistake, Miss Julie," he amended with a small bow. "And excuse my rudeness-- I'm Doctor Leonard McCoy." He offered her a smile.
"Now, the dermal regenerator," he held up the tool again, this time activating it and waving it over the injured area of her arm, "fixes cuts an' scrapes by basically speeding up the healin' process." Granted, it was quite a bit more complicated than that but this girl couldn't be a day over six (if that!), so he seriously doubted she'd absorb anything more complicated.
Once he was done, McCoy put down the tool and looked at the girl's face to gauge how she'd tolerated the procedure. "There we go, good as new. Wanna test her out?"