Talk to Dermatologist on Insect Bite, Numbness, No Swealling

Hi, 2 days before some insect bitten me on left leg right under the knee, I applied Ice and the pain stopped, but the very next morning I was feeling numbness in the bitten area. Nothing visible symptoms on leg, neither swelling nor any marks.

Now, that numbness is moving towards foot, the leg is moving perfectly fine, i don't feel any pain. If i scratch my leg i can feel the sensation as well. I am not sure that what bitten me, it was dark and I was laying on roof. Let me know, how can i treat it does i need to take any medication?