White patches on the skin may be caused by post-inflammatory depigmentation, anaplastic nevi or vitiligo. 1. Post-inflammatory depigmentation: If you have a history of eczema, dermatitis, or folliculitis before you have white patches on your skin, you may have post-inflammatory depigmentation. 2. Aberrant nevus: Aberrant nevus is mainly caused by the disappearance of melanocyte function, the color is usually milky white, there is no rash, and the border of the white spots is relatively clear. 3. Vitiligo: Vitiligo is a relatively common skin disease, mainly due to the lack of melanin in the patient’s body, the main symptom is that there will be white patches on the skin. There are also a variety of situations where the skin will appear white spots, such as lichen planus, etc. It is recommended to actively go to the regular hospital for relevant examinations, clear diagnosis, so as to target the treatment.