A lot of small bumps on the penis can be seen in the local infectious diseases, but also can be seen in the external adverse stimuli, drug allergies, and so on. 1. local infectious diseases: common in the pearly penile papules, the foreskin glans, condyloma acuminatum genital herpes and molluscum contagiosum, etc., which pearly penile papules generally have no self-awareness of the symptoms, no dysfunction, do not need special treatment, the other diseases need to go to the hospital in a timely manner to see the appropriate treatment. 2. External adverse stimuli: commonly found in sweat, sanitary products or underwear stimulation, may also cause small bumps on the penile area, need to avoid the above stimuli in a timely manner. 3. Drug allergy: If the application of certain drugs, can be caused by the allergy, may also appear the above symptoms, can be under the guidance of the doctor to stop or replace other drugs. It is recommended to go to the hospital in time to avoid delaying the condition.