Fire cupping is a special way of curing disease popular among Chinese people for a long time. The treatment is to cure disease by creating a vacuum in the cup placed flush against the patient's skin through various ways of removing the air inside the cup. Generally, the cup is left in place for about 10 minutes (typical range is 5–15 minutes). The skin becomes reddened due to the congestion of blood flow. The cup is removed by pressing the skin alongside it to allow some outside air to leak into it, thus equalizing the pressure and releasing it. Some bruising along the site of the rim of the cup is expected. Today, cupping is mainly recommended for the treatment of respiratory diseases such as the common cold, pneumonia, and bronchitis. Cupping is also used to treat back, neck, shoulder, and other musculoskeletal pain.