The most common condition of perianal itching for infants and young children may be pinworms. In addition to perianal itching, the child will also have poor night sleep, crying and restlessness, as well as abnormal mental excitement, as well as xenophagia, such as like to eat dirt, cinder, etc., in addition to loss of appetite, nausea, vomiting, abdominal pain, diarrhea and other symptoms. In this case, it is best to take a further examination and scrape the dirt from the perianal mucosa to check for eggs and see if it is pinworm disease. For adults, hemorrhoids, perianal eczema and other conditions may cause perianal itching, it is best to go to the anorectal surgery for further examination.