A patch of white skin on the scalp may be related to anaplastic nevus, post-inflammatory hypopigmentation, vitiligo and so on. 1. Apochromatic nevus: It may be a limited light spot that appears just after birth or shortly after birth, and is usually single. It can last for life and there is usually no pigmentation around the white spot. 2. Post-inflammatory hypopigmentation: If there is a past history of dermatitis or psoriasis at the site of the white spot, resulting in localized hypopigmentation of the skin on the head, white spots may also appear at the site of the lesion. 3. Vitiligo: it may be related to autoimmune, neurochemical factors, genetic and other reasons, leading to abnormal melanin production. When this disease occurs in the head, the head skin will appear white spots. A piece of white skin on the scalp can also be seen in other causes, it is recommended to consult a doctor in a timely manner, follow the doctor’s instructions for the relevant examination, with the help of the doctor to clarify the cause, and targeted treatment or treatment, do not blindly deal with their own.