Red bumps on the penis may consider folliculitis, circumcision and glans and sexually transmitted diseases such as warts and genital herpes, further examination is recommended. 1. Because there are hair follicles and sweat glands distributed in the penis, so if you usually do not pay attention to personal hygiene and do not do a good job of cleaning may lead to folliculitis, sebaceous cysts and so on. 2. Foreskin glans inflammation: if there is a long foreskin, prepuce, etc., due to the long foreskin wrapped glans, resulting in difficulty in timely cleaning, the long-term stimulation of the foreskin scale may trigger the foreskin glans inflammation, resulting in Candida albicans and other infections, the appearance of red bumps. 3. Sexually transmitted diseases: if there is unclean sex, may be infected with herpes virus and other causes of genital herpes, warts and other sexually transmitted diseases, early may appear red bumps. Serious cases are recommended to go to the hospital in time for further examination and clear diagnosis.