Red bumps on men’s lower body usually refer to red bumps on the scrotum as well as the penis, which may be caused by folliculitis, eczema, warts, genital herpes and other factors. 1. Folliculitis: not paying attention to the hygiene of the lower body may lead to infection of the hair follicles, and when the infection worsens, red bumps will appear on the hair follicles, with pus inside the bumps, accompanied by itching. 2. Eczema: it may be related to environmental factors, dietary factors and other factors, which can lead to the appearance of red pimples on the lower body, accompanied by intense itching, and there will be oozing after scratching. 3. Condyloma acuminatum: It is a sexually transmitted disease, which may be caused by sexual contact or indirect contact, and can cause red or skin-colored bumps on the scrotum and penis, which are in the shape of cauliflower pattern, accompanied by mild itching and pain. 4. Genital herpes: usually caused by herpes simplex virus infection, most of them have bad sexual contact, which can make red bumps appear on the lower body, usually erythema, blisters, accompanied by tingling, and highly contagious. Men with red bumps on their lower body with obvious abnormal symptoms are advised to seek medical attention for appropriate examination and treatment to avoid aggravation of the disease.