The appearance of small white patches on the legs may be related to post-inflammatory hypopigmented patches, senile white patches, vitiligo and so on. 1. Post-inflammatory hypopigmented spots: often occurring after the healing of burns, herpetic dermatosis, skin infections and other inflammatory diseases, hypopigmented patches of varying sizes may appear. 2. Age-related white spots: may be the manifestation of skin aging. The skin is round or oval white patches of pinpoint to mung bean size, usually occurring on the trunk and limbs, usually without conscious symptoms. 3. Vitiligo: related to autoimmune dysfunction, mental trauma and so on. It is mainly due to the destruction of melanocytes in the local skin, resulting in a lack of melanin and the appearance of white patches. The small white patches on the legs can also be seen in other causes, it is recommended to timely medical treatment, comply with the doctor’s instructions for the relevant examination, in the doctor’s help to clarify the cause, and targeted treatment or treatment.