They are bad.
Ian's eye was even more swollen when it first happened. It didn't seem to bother him so we just waited for the swelling to go down on its own and didn't take him to the doctor. The mosquitos are biting their faces because the pajamas cover the rest of their bodies. Ian has a few others on his face as well that really swelled up. Eva doesn't seem to react as badly. We have something that plugs into the wall, but I think we need some mosquito nets.
We saw a little electrified racket for killing mosquitos. Supposedly you can picked them up for 7,000 won.