pityriasis alba

例句：

1. 1.The patient has pityriasis alba, which is a common skin condition.
   患者患有白皮病，这是一种常见的皮肤病。
2. 2.Pityriasis alba can be treated with topical creams and ointments.
   白皮病可以通过外用药膏和油膏治疗。
3. 3. It's important to keep the affected area clean and dry to prevent further spread of pityriasis alba.
   保持受影响区域清洁干燥非常重要，以防白皮病进一步传播。