This is a simple case of an included, not erupted, lower third molar extraction.
Incision is done down the line and around the preceding molar, as well as the vertical discharge in the middle of the vestibular side.
The flap is open and the periostium is peeled off the bone
A round drill is used with physiologic serum irrigation to remove the covering vestibular bone until the molar can be pulled off.
Luckily the molar comes out intact together with the surrounding inflammatory process.
Stitches are used to place the flap back in place.