A few itchy sesame-sized bumps on the perineal skin can be considered to be related to eczema, scabies or folliculitis secondary to pubic lice disease. 1. eczema: vulvar skin with intense itching, can be caused by hot water scalding, excessive scratching and other reasons for local redness, swelling, oozing and vesiculation, long-term repeated episodes will be chronic, the local skin has a moss-like changes. 2. Scabies: mainly caused by scabies mite, can invade the external genitals, lower abdomen and other parts of the skin lesions manifested as papules, papules, there can be inflammatory redness, local itching. 3. Pubic lice disease secondary folliculitis: caused by the patient or spouse with a history of unclean sexual contact, etc., the pubic hair part has intense itching, scratching leaves scratches, scabs or scattered bleeding bruises, excessive scratching can be secondary to folliculitis and boils, the formation of inflammatory papules, pustules. Itchy bumps on the perineum may have other causes, it is recommended to consult a doctor in a timely manner, to clarify the cause of the disease, follow the doctor’s instructions for treatment, do not blindly deal with their own, so as to avoid adverse consequences.