hematoma of sternocleidomastoid muscle

例句：

1. 1. He sustained a minor injury and had a small hematoma on his forehead.
   他受了轻伤，额头上有一个小血肿。
2. 2. The doctor advised him to keep the wound clean and avoid putting pressure on the hematoma.
   医生建议他保持伤口清洁，避免对血肿施加压力。
3. 3. After the surgery, the patient was monitored closely for any signs of infection or hematoma formation.
   手术后，患者被密切监测，以防感染或血肿形成的迹象。