The causes of crescent white spots on both sides of the nose include vitiligo, simple furfura, anemic nevi, and post-inflammatory hypopigmentation. 1. Vitiligo: If it is an acquired pigmentation loss caused by various factors, the phenomenon of crescent white spots on both sides of the nose can occur at this time. 2. simple chaff rash: due to various factors lead to nose chaffy scaly hypopigmented spots, this time can also appear on both sides of the nose with crescent-shaped white spots. 3. Anemic nevus: due to congenital factors triggering abnormal vascular development, blood supply is reduced, so the melanin production is insufficient leading to hypopigmentation, which can appear as crescent white spots. 4. Post-inflammatory hypopigmentation: due to various factors triggering skin inflammation, inflammatory factors damage melanocytes, leading to melanin reduction, and then appear on both sides of the nose with crescent white spots. The phenomenon of crescent white spots on both sides of the nose suggests timely medical treatment, improve the examination to clarify the cause of the disease, and standardize the treatment under the guidance of the doctor.