I live in Alaska. I was fishing and I got plenty of mosquito bites. But today (2 days after getting home) I noticed that some of the itchy bites turned into hard round bumps, about 5-6cm. The area is red but the top of the bites are kinda white. And are still very itchy. The other bites from mosquitos don't itch any more. I was in a swampy grassy area with slow to still water that came off as lake.