Why do flat warts appear on the face and forehead?

The main cause of flat warts appearing on the face and forehead is infection with human papillomavirus (HPV), particularly types HPV-3 and HPV-10. These viruses can spread through direct contact with the skin of an infected person or through sharing personal items (such as towels and razors). Additionally, a decline in immune system function is another significant factor contributing to the development of flat warts. When the immune system is weakened, the body's resistance to HPV decreases, making it easier to become infected and develop flat warts. Moreover, poor personal hygiene, skin injuries, and genetic factors may also increase the risk of developing flat warts. Therefore, key measures for preventing flat warts include maintaining good personal hygiene, boosting immunity, avoiding direct contact with infected individuals, and promptly treating skin injuries.