A few small pimples on the foreskin of the penis may be the result of some kind of skin disease, such as penile perlis, folliculitis, genital herpes and so on. 1. Penile Pearl Rash: It is a skin disease that occurs at the coronal edge of the penis and may also appear at the coronal groove. It is usually related to local stimulation or physiological developmental variations. The main symptom manifests itself in the form of light pink papules on the skin, which are pearl-like in shape. 2. Folliculitis: an inflammatory skin disease caused by the involvement of hair follicles, may also occur in the scrotum, penis and prepuce. Repeated local irritation may cause red pimples with itching and pain, and when the condition worsens, pimples the size of chicken pox may appear. 3. Genital herpes: It is caused by infection with herpes simplex virus, which is contagious and spreads mainly through sexual contact. The main manifestation is blisters on the genitals, and there are obvious itching, pain and other symptoms, and there will be ulcers formed on the surface of the skin. In order to distinguish the cause of small chicken pox on the foreskin of the penis, it is recommended to consult a dermatologist as soon as possible, and then diagnostic analysis based on pathological examination, antigen examination microscopic examination, to understand the cause of the disease and then standardized treatment.