Speaking of groin itch we must be a little talk about the feeling of tiger, in fact, he is not terrible, the terrible thing is that we do not understand it, can not identify it and delay the treatment, let us see from which aspects of the identification of groin itch is introduced. 1, anal itch: anal pruritus (peritus ani, PA) is a common local pruritus. Sometimes there is a slight itching in the anus, if the itching is severe and persists for a long time, it becomes pruritus. It is a common confined neurological dermatosis. It is usually limited to the perianal area, and some may spread to the perineum, vulva or the back of the scrotum. It occurs mostly in the middle and old age of 20 to 40 years old, less frequently in young people under 20 years old, and rarely in children. It is more common in men than in women, and this pruritus occurs more often in people who are used to quiet and infrequent exercise. Secondary pruritus has obvious causative factors, easy to treat; spontaneous or unknown causes of PA is not easy to cure, but also often relapses, accounting for about 50% of all patients. 2, itchy urethra: sexual gonococcal urethritis (acute gonorrhea): incubation period of 1-14 days, often 2-5 days. Initially, for acute anterior urethritis, urethral orifice redness, swelling, itching and slight stinging, followed by thin mucus outflow, causing discomfort in urination. 3, scrotal itching: scrotal itching is usually caused by scrotal eczema, allergic dermatitis, scabies, etc. Scrotal itching is a very common manifestation, especially in young men. 4, anal eczema itching: anal eczema itching is a kind of secondary itching. Secondary pruritus arises from primary diseases and various skin diseases, accompanied by obvious specific skin damage and primary lesions, itching is often a symptom of the primary lesion. For example, anal pruritus caused by anal fistula, anal eczema, eczema, neurodermatitis, anorectal tumor, pinworms, etc. are all in this category. The main symptom is significant local itching. The disease is prone to recurrence. It is mostly transmitted through contact with patients with ringworm, through cats and dogs, indirectly through clothing and utensils, or by scratching and spreading the infection. In summer, when the climate is hot and humid, the human body sweats a lot, especially in the femur, and if you do not take a bath in time or wear tight underwear with a lot of sweat that does not evaporate in time, you are prone to get this disease. In addition, patients suffering from diabetes, excessive leukorrhea, etc., as well as long-term oral or topical application of a large number of broad-spectrum antibiotics or corticosteroids, are also susceptible to ringworm. In terms of incidence, it is mainly in young people and more in men than in women. The disease tends to occur in the summer and is often aggravated by humid or hot climates and is relieved or cured in the winter. Tinea corporis is a skin disease that affects the femoral area and sometimes the perineum, mons pubis, perianal area, buttocks, and scrotal folds. It itches intensely, and due to scratching, patients may develop secondary dermatitis, lichenified changes, or secondary infections.