Cupping, also known as "Gua Sha," is a traditional Chinese medical therapy that involves repeatedly scraping the skin surface with a scraping tool or similar instrument to stimulate specific acupoints or meridians. This practice aims to promote blood circulation, relieve pain, detoxify, and achieve other therapeutic effects. Below are the main characteristics and steps of Gua Sha:

### Main Characteristics

1. **Tools**: Commonly used scraping tools are made of materials such as ox horn, jade, or ceramic.

2. **Medium**: Typically used with scraping oil or essential oil to reduce skin friction.

3. **Areas**: Mainly performed on areas with thicker muscles, such as the back, neck, and shoulders.

4. **Reaction**: After Gua Sha, the skin may show red or purple bruise-like marks, known as "Sha," which usually fade within a few days.