Anal scratching is a symptom that is often secondary to anal fistula, anal fissure, internal hemorrhoid prolapse, anal papillitis, anal incontinence, warts, perianal skin disease, parasites, vulvar inflammation, and menopausal conditions with significant specific skin damage and primary lesions. The clinical manifestations are intense itching of the anal canal and perianal skin, initially limited to the perianal skin, with varying degrees of severity of scratching, if not cured for a long time, it can spread to the scrotum or labia, especially between the perineum and the anterior and posterior crevices. Infection.