The penis has a little itchy bumps may be scrotal eczema, contact dermatitis, genital herpes and other diseases. 1. Scrotal eczema: the cause of scrotal eczema is not yet clear, it may be due to abnormal immune function, heredity, mental stress, emotional fluctuations and other factors. Patients will appear in the scrotum area itching, pimples, small blisters, swelling and other symptoms, some patients can spread to the penis area. 2. Contact dermatitis: contact dermatitis may be caused by the stimulation of sensitizers such as underwear, condoms, drugs, medicines and so on. Patients present with penile itching, erythema, papules, papules and so on. 3. Genital herpes: genital herpes is mainly caused by herpes simplex virus infection. Patient symptoms for local skin blisters, redness, swelling, itching, etc., can appear penis has a little itchy pimples of the situation. There are many reasons why patients have a little itchy bumps on the penis (such as warts), it is recommended that patients go to the whole hospital to find out the cause of the disease.