Cách sử dụng
A cyst is a small bump or sac that can form on or under your skin. It's usually filled with fluid or pus. Cysts can happen anywhere on your body, including your face, neck, chest, or back. They can be caused by many things, such as a blocked duct or a buildup of dead skin cells. If you have a cyst, you should see a doctor to determine the best course of treatment.