Many adolescents will have small white spots of different sizes on their faces. Folk believe that this spot is a sign of roundworms in the stomach. Therefore, the name “worm spot” is used. In fact, the so-called “worm spot” is a localized hypopigmented circular or oval patch of skin. Initially it is light red, and later it passes to light white, with clear edges, covered with a small amount of fine scales, and with mild itching. In addition to the face, it can also be seen on the upper arms, neck or shoulders. Medical tests have confirmed that not all adolescents with “worm spots” have parasites such as roundworms in their bodies, and the so-called “worm spots” are actually a skin disease. The medical name of “worm spot” is white furfuraceous rash, also called simple furfuraceous rash, which is a common skin disease of adolescents. The cause of the disease is still unclear, but it may be related to streptococcus skin infection, lack of sebum protection on the skin surface, excessive washing, sun exposure, dry skin, lack of B vitamins and trace elements (such as iron, zinc, etc.) factors. Ascariasis cannot be diagnosed by the “worm spot” alone, and the diagnosis can only be confirmed by finding ascaris eggs in the fecal test. White furunculosis generally does not need treatment, those who have symptoms can apply sulfur cream or metronidazole cream. The main thing to prevent white furunculosis is to avoid exposure to the sun, avoid soap, washing powder excessive washing. Eat more vegetables and fruits.