Femoral groove itching mainly has the following common causes: 1, hemorrhoids is the most common one, when hemorrhoids occur, the nucleus of hemorrhoids repeatedly prolapse to stimulate the perianal skin, causing perianal skin itching. At the same time the prolapsed hemorrhoid nucleus also stimulates the perianal skin to secrete mucus, which can easily trigger perianal eczema and aggravate perianal itching. 2. Taking too much spicy food or too many condiments, such as chili, mustard, pepper, spices and other irritating foods, can cause anal skin irritation appearing perianal itching. 3. There is an allergic reaction, after taking or contacting allergens, such as pollen, drugs, paints and other items to make the human body produce 4, mental factors, such as excessive mental excitement, anxiety, etc. can also cause anal itching. 5, anal itching can also be secondary to parasitic, bacterial infection.