Extra itchy scrotum with long hair may be caused by itching symptoms due to fungal and bacterial infections, or it may be caused by a lack of certain substances in the body or other neurological diseases. Men who perform physical labor for a long time or exercise for a long time may also suffer from itching due to prolonged friction between the scrotum and underwear. Some non-infectious diseases, nutritional metabolic diseases and other factors can also cause itching at the scrotum long hair. A. Environmental factors: When the weather is hot, the skin of the patient’s perineum will be prone to sweating and humidity, and sweat and other secretions stimulating the skin of the scrotum area will cause itching. High outside temperature, wearing underwear with poor breathability, poor water absorption, and rough quality will also cause itching symptoms to appear. Second, disease factors: 1, infectious diseases: such as folliculitis, scrotal lice disease, herpes zoster, condyloma acuminata, ringworm, scabies and other diseases, due to pathogenic infection will cause inflammatory reactions, the scrotal area of the hair follicles and skin easily stimulated and damaged, itching will occur; 2, non-infectious diseases: because the scrotal area is in a long-term closed state, under the joint action of various factors, will cause some to Itchy non-infectious diseases such as eczema, allergic dermatitis, contact dermatitis, seborrheic dermatitis, neurodermatitis, etc. can cause itchy scrotal hairy areas and may cause hair loss after scratching; 3. Nutritional metabolic diseases: such as riboflavin deficiency may lead to scrotal inflammation, which can cause itchy scrotal areas. And, other nutritional metabolic diseases such as scrotal pruritus and senile vulvar pruritus can also cause special itching at the scrotal long hair.