cold ulcer

例句：

1. 1. He developed a cold sore on his lip after being out in the cold for too long.
   他在寒冷中待得太久后，嘴唇上长了一个冷疮。
2. 2. The doctor advised him to take extra care when going outside in the winter, as he has a tendencyto frostbite.
   医生建议他冬天外出时多加小心，因为他容易冻伤。
3. 3. During the cold season, it's important to keep warm and avoid getting frostbite.
   在寒冷的季节里，保持温暖并避免冻伤是很重要的。