I walked at the park and got bit by a bug that caused my whole hand to be swollen. What caused it? What could have caused it? I had a bite and it came out with a raised itchy pink bump. I thought mosquito but I didn’t itch and the next day my whole hand was swollen I’ve never had an allergic reaction with a mosquito so what else could it have been? It also bit my other hand, but no swollen. Fucker had a field day