The causes of a hard milia growing in the skin of the penis may include sebaceous ectasia, penile sclerosis, pearly papules, and condyloma acuminatum. 1. Sebaceous gland ectasia: It usually manifests as a slightly raised pimple on the penile skin, which can persist for a long time. There are usually no uncomfortable symptoms, so no special treatment is usually needed. 2. Scleroderma: a hard nodule or keloid usually formed in the corpus cavernosum of the penis. It is mainly due to localized accumulation of inflammatory factors and residual lesions from surgery. It is recommended to clarify the scope and depth of the lesion and treat it in time. 3. Pearl-like papules: usually associated with circumcision, poor local hygiene and other factors, often manifested as light red or white surface smooth hard pimples. This is not contagious and does not require special treatment. 4. condyloma acuminatum: a sexually transmitted disease, can appear rice-like pimples. As the disease progresses, the pimples can merge with each other, transforming into papillary-like cauliflower-like lumps, and there will be pain and bleeding and other symptoms. It needs to be treated as soon as possible. The first thing you need to do is to get a good deal of money to pay for the services you need, and then you’ll have to pay for the services you need.