Itchy red bumps on the hairy part of the lower body of men may be caused by physiological factors such as not paying attention to hygiene, or may be caused by pathological factors such as folliculitis, genital herpes and pubic lice. 1. Physiological factors: men do not pay attention to private hygiene, or private parts are often in a humid environment, easy to lead to the lower body pubic hair long red bumps, accompanied by itching symptoms. Usually after changing bad habits and paying more attention to hygiene, it can be relieved by itself. 2. Folliculitis: Folliculitis is mainly caused by bacteria, fungi and other pathogens that cause hair follicle infections, often manifested as the formation of red pimples around the hair follicles, accompanied by redness, swelling, fever, itching, pain and other symptoms. 3. genital herpes: genital herpes is mainly caused by human herpes virus infection caused by skin diseases, male infection often manifested as blisters, red bumps, itching and other symptoms in and around the genital area. 4. Pubic lice: the patient or his spouse has a history of unclean sexual contact, or has stayed out before the onset of the disease. The pubic hair area is intensely itchy, more so in the evening, mainly confined to the pubic bone area, can also occur in the perianal area, lower abdomen and other places, there can be red bumps and itching on the lower body. Men’s lower body hair part long red bumps, itching may also be other causes, it is recommended to timely to the hospital examination in order to clarify the cause of the disease, in the exclusion of physiological factors and then by the doctor’s guidance to choose the appropriate way to target treatment.