Red area with blisters

For 2 months now I have had alot of misquito bites but there was one "bite" on the back my right ankle that I believed to be another misquito bite but this one ended up gettin wider and I developed blisters in the red area. It itched really bad but once in awhile I would get sharp pains in it and it would throb and if I bumped it on something it would hurt so bad. The blisters would always drain and once it would stop draining it had a yellowish color that basically would get crusty from where I assume the fluid was dry. I have no clue what it could be but PLEASE HELP ME! It really worrys me!