The first thing to consider is whether the feet have been traumatized or sunburned, and localized hypopigmentation occurs after healing. In fact, if there is a history of localized skin inflammation, localized hypopigmentation may also occur after the inflammation subsides, resulting in the appearance of white spots. In addition, the following common clinical diseases can be manifested as feet long white spots small dots. 1, vitiligo: is a common acquired pigmentation loss of skin mucous membrane disease. The cause of the disease is not clear, considering the possibility of genetic, neuropsychiatric, immune and endocrine metabolism and so on. Predominant in any age, any part of the body, manifested in the color of the size and shape of the color loss of white spots; 2, anemia nevus: for the limited skin vascular tissue developmental defects caused by the light-colored spots. It appears after birth or during childhood, and does not recede for life. It can occur in any part of the body, and manifests itself as a round or oval light-colored spot with clear boundaries and irregular edges; 3. Senile white spots: it is a kind of round white spots caused by aging of the skin and reduction of melanocytes with ageing, and it is mostly seen in middle and old age. It is a kind of round white spots caused by the decrease of melanocytes with the aging of the skin, mostly seen in middle-aged and old people. It may appear as purple, tan, pink, or white patches. The diameter is 4-5mm or larger, can be fused, scratching has scales produced.