Penile pimples are divided into many kinds, seborrheic dermatitis and the inflammatory skin disease caused by seborrheic dermatitis, pearly penile papules, eczema, allergies and so on can be caused. 1. Seborrheic dermatitis: mostly related to bacterial infection or fungal infection, often with small particles, more red patches of different sizes, the surface may also have greasy scales attached. 2. Pearly penile papules: refers to the pearly, translucent papules occurring in the coronal groove of the glans, which may be white, yellow or light red, and the papules are not fused with each other. The cause of pearly penile papules is unknown, it is not contagious, it is usually not harmful to health, it does not cause dysfunction, and if there are no other symptoms, it usually does not need to be treated. 3. Eczema: may be caused by environmental changes, allergen stimulation, abnormal immune function and other factors, may appear in the penis blisters, red papules, accompanied by redness, swelling, itching, breakage or inflammatory exudation. Blood test shows eosinophilia. 4. When there is allergic material contact in the penile area, the symptom of a lot of small particles may also appear, which may be accompanied by local itching or slight pain, and some patients may also be accompanied by other parts of the red rash and other symptoms. There are many causes of penile papules, it is recommended to consult a doctor to clarify the cause of the disease and follow the doctor’s instructions for treatment.