Not sure of question: but an insect bite can swell and form a blister, especially after a lot of scratching, but since the redness and swelling are gone, it sounds like this is responding normally. If the lesion was infected, it would be more swollen, red and painful. Avoid rubbing or scratching, keep it open to the air, and it should form a scab soon. No relationship of blister with mosquito borne illnesses.
Answered 10/8/2018
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