Some large cysts can be reduced by opening a window, and then surgery can reduce trauma and recurrence.

You should also open the window. But at the same time of opening the window, a small cyst should be cut for pathological examination to determine the type of cyst.

Washing every day is useful. Go to the hospital for X-ray reexamination regularly (for one month).

You'd better go to the hospital for a checkup. There is pus, indicating infection.