Sounds like its healing fine to me. Exposed jaw bone (or dry socket) is extremely
painfulPainful menstrual periods and you would know that your jaw bone is exposed cause its very
painfulPainful menstrual periods. It sounds like its either food sticking out or perhaps the collagen healing in the socket. Gently rinse the area out and keep the area clean. Don't force anything into the socket to disturb the healing process and it should close up on its own.
Any changes in symptoms (such as swelling, pain etc) should be checked but otherwise, let nature take its course.