Fat necrosis that occurs after trauma is the necrosis of superficial adipose tissue on the body. These adipose tissues do not have a lot of blood supply themselves, and when combined with localized damage to small blood vessels caused during trauma, can lead to necrosis of fat cells. Treatment depends on the specific injury, necrosis, and requires surgical methods. If there is significant necrotic tissue, debridement is required to remove the necrotic fat tissue and then the granulation tissue is slowly filled to promote healing. If there is inflammation and infection, antibiotics should be used. If there is local fluctuation and fluid accumulation, surgery can be considered for incision and drainage. In normal life, we must pay attention to regular work and rest, reasonable diet, drink more water, and exercise more to enhance physical fitness.