How do i reduce swelling from a mosquito bite?

i am allergic to mosquito bites. they swell up HUGE and look really emberassing. i just got one on my upper thigh that is so big it's about the size of a softball, no joke. i got some rite aid bite and sting relief to rub on it but it hasn't really done anything. does anyone know of any tricks to reduce the swelling at least? thanks!