Small white spots on the skin are considered to be caused by senile leukoplakia, leukoplakia, florid chaff rash and other diseases. 1. Age-related leukoplakia: Age-related leukoplakia is a kind of skin hypopigmentation phenomenon, which is caused by the decrease in the number of dopa reaction-positive melanocytes in the skin. Patients will appear in the trunk, limbs and other parts of the round pea-sized white spots, with the development of the disease, can gradually increase, usually no conscious symptoms, does not affect the health. 2. White chaff rash: the cause of white chaff rash is not yet clear, it may be due to Malassezia furfur infection, malnutrition, vitamin deficiency and other factors. Patients will appear round pigment loss spots, can be manifested as pale color spots, the surface covered with dry bran-like scales. 3. Blotchy furuncle: Blotchy furuncle may be caused by Malassezia infection, heredity, high temperature and humidity and other factors. Patients will appear spotty rash, the surface covered with scales, and the lesions are white and light brown. There are many reasons that lead to small white spots on the skin, and it is recommended that patients go to regular hospitals to find out the cause of the disease and follow the doctor’s instructions for treatment.