A small bump on the penis is considered to be related to warts, penile eczema, genital herpes and other diseases. 1. warts: usually due to the body infected with human papilloma virus, so that around the penis in the stimulation of viral infection, which in turn caused the phenomenon of growing a small lump on the penis, warts may appear pimples, redundancy and other symptoms. 2. Penile eczema: usually due to the lack of attention to hygiene and cleanliness around the penis, too much moisture around the penis, contact with allergens to stimulate the skin and other factors, resulting in the phenomenon of a small pimple on the penis. Symptoms such as itching may also occur. 3. Genital herpes: It may be due to the infection of herpes simplex virus around the penis, the penis skin under the stimulation of the virus, resulting in the phenomenon of a small pimple on the penis, and there will be pimples, itching and other symptoms. If the phenomenon of a small bump on the penis, you can go to the hospital in time to avoid delaying the condition.