why do some mosquito bites swell up and others stay small on the same victim?

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For reference, I tend to have bad reactions to mosquito bites. It’s pretty much always been an all-or-nothing situation as far as reactions go, but I got bit 4x yesterday and 2 bites have remained small and typical and the other 2 are huge, red, surrounding skin is swollen, and hot.

What made these differ? I was indoors at the time but I think a mosquito fit through my window screen somehow. It’s the only way I could’ve been exposed. What are the odds 2 different ones got into my house and only bit me? I have a bite on my elbow (normal), foot (swollen), and 2 on my opposite thigh (one of each).

In: Biology

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