1. High-speed rubbing: If you fall from a height quickly and slide on the rough ground for a long time, it will cause a large area of skin abrasion and contusion, and it is easy to form obvious and serious scars after healing.

2. Seriously scratched by sharp objects when falling: If you fall on objects with glass fragments, sharp metals, etc. Cause a deep and irregular wound, which is easy to leave scars and may be more serious.

3. Severe fracture with skin tear after falling: the fracture end pierces the skin, causing large-area and deep trauma, and may also produce serious scars after healing.

4. Serious car accidents and falls: under the violent impact, many parts of the body were seriously injured, resulting in deep wounds, extensive injuries and possibly heavy scars.