Cupping Therapy uses suction cups to create a vacuum on the skin and may leave bruising. The suction created by the cups causes the blood vessels to expand, bringing fresh blood and oxygen to the area. The circle bruises that can appear after cupping are caused by the suction and pressure of the cups on the skin. These bruises, also known as "cupping marks," are not a sign of injury or harm, but rather a sign that the treatment is working. The duration of the bruises can vary from person to person and can last anywhere from a few days to a few weeks, depending on the individual's healing process. Cupping therapy is not recommended for people with certain medical conditions, so it's best to speak with a qualified practitioner before trying it out.