I had a wisdom teeth removal surgery before it pops out 20 days ago and i can see that there is a hole next to the second molar ( not in the stitched area ) is this normal ?

We do not have access to what you are seeing. Please note this yourSurgeon is responsible fornyour Post-Surgical care is an educational site, not a diagnosis and treatment site. The probability is you are just fine, especially if there is no pain, bleeding, or swelling. That said, your Oral Surgeon is responsible for your Post-Surgical care. Call his/her office and explain your concerns.