Dot-drop psoriasis is the initial manifestation of common type psoriasis, for example, the patient’s skin appears dotted with red spots and pimples, and if the patient is allowed to scrape with his fingernails, the pimples will appear silvery-white, multi-layered scales. Therefore, it is believed that pitting psoriasis is the initial manifestation of psoriasis, and the causes of the disease are mainly in the following aspects: 1. The cold season of November-April belongs to the main reason for the onset of the disease, and there are statistics that show that there are more patients in the north than in the south, and there are more patients in the winter than in the summer, spring, and fall; 2. Excessive consumption of spicy food, mutton, alcohol and other hairy things lead to blood heat embedded in the skin, and the skin loses nourishment, which leads to pitting psoriasis; 3, Respiratory infections in children and adolescents, such as tonsil inflammation, may cause pitting psoriasis; 4. Emotional stress at work, lack of sleep or staying up late, etc., which cause heart and liver fire, leading to pitting psoriasis.