Hi. I Just Got My Wisdom Teeth Extracted 2 Days

Hi. I just got my wisdom teeth extracted 2 days ago. Two on top, one on the bottom, which was impacted. Today, I noticed some white stuff growing around my gum and hole where the extraction took place. I thought it was food particles at first, but seems like it's growing where the hole is. What is this? Is it dry socket? It doesn't hurt or anything.