Here's why:
* Hair growth is primarily controlled by hormones and genetics. Cuts and bruises are localized injuries and don't significantly alter the hormonal or genetic factors that regulate hair growth.
* Hair growth is a continuous process. While injuries might cause temporary hair loss in the affected area due to trauma, the hair follicles remain intact and will continue to produce new hair.
* Focus on wound healing. When you have a cut or bruise, it's important to focus on proper care for the wound to ensure it heals correctly and prevents infection.
In summary, hair growth is not accelerated by cuts or bruises. They might cause temporary hair loss in the affected area, but the hair will eventually grow back.