Itchy pubic hair in men is considered to be caused by physiological factors such as poor hygiene habits, poor breathability of underwear, or folliculitis, contact dermatitis, sexually transmitted diseases. 1. Physiological factors: poor hygiene habits, poor panty breathability, tight underwear and other physiological factors may lead to the accumulation of bacteria in the pubic hair, resulting in the phenomenon of male perineal hair itching. 2. Folliculitis: caused by bacterial or fungal infection, hair follicle injury or irritation and other factors. Patients will have symptoms such as pimples and pustules centered on hair follicles, and patients will mostly feel itching or tenderness and pain, which manifests as itchy male pubic hair. 3. Contact dermatitis: skin inflammation caused by skin contact with allergens, patients will be manifested as erythema, papules or mild edema, etc., mostly accompanied by itching, swelling, burning and other phenomena, so that the patient appeared male pubic hair itching symptoms. 4. Sexually transmitted diseases: such as pubic lice infection, belongs to a sexually transmitted diseases, infected with pubic lice because pubic lice mainly gathered in the root of pubic hair, men will feel the pubic hair part of the itching is serious. Men will pubic hair itching patients, it is recommended to go to the regular hospital, under the guidance of the doctor, to clarify the cause of the disease, symptomatic treatment measures.