(She would hope Xion hasn't eaten any scavengers since then. They're pals and all that, but Mikasa does have her objections about watching her fellow man get eaten.)

They may have been a settlement near the desert. We we traded with groups like those; desert plants are used in numerous remedies, including ones for Sandwing venom.

(Though really, any scavenger who got stung with those enormous tails would probably be dead. Still, just in case.)