A small pimple in the skin of the penis may be related to folliculitis, scabies, warts and other diseases. 1. Folliculitis: when there is folliculitis formation in the penile skin, it can lead to the appearance of scattered distribution of isolated red pimples on the surface of the penile skin, pimples can be secreted with pus and painful symptoms after gradually turning red. 2. Scabies: The disease can lead to the appearance of scabies nodules on the penile skin. Scabies nodules can be distributed in the penis or scrotum and glans and other parts of the penis, manifested as soybean-sized pimples. At the same time, scabies is contagious and can cause a red rash around the body, accompanied by intense itching. 3. Condyloma acuminatum: It is a sexual disease that is usually spread through sexual contact. When suffering from this disease, it can lead to the appearance of surface roughness, pimples of different sizes on the penile skin, part of which is cauliflower pattern. Also, it can manifest as pimples the size of a soybean on the skin of the penis. The above symptoms may also be caused by other factors, and patients are advised to go to regular hospitals in time to clarify the cause of the disease and carry out targeted treatment, so as not to delay the condition.