Insect bite

I have a bite on my leg, and its not my usual bite (I usually just get basic bites). Its very sore and tender and quite large, plus about a 3cm ring of a paler red around which is also tender. Its also very warm and hurts if i bend that leg, walk, or cross or really put any type of pressure. Im sure its nothing serious but i’m a hypochondriac and just get awfully curious when somethings even the smallest bit wrong. also ignore the dots for hairs on my leg, sm joys of being dark haired