Transparent pimples on the foreskin are painless and itchy, which may be caused by sebaceous gland ectasia. If accompanied by itching and other symptoms, it may be caused by fungal infections, which can be treated with topical ointment. Sebaceous ectasia is generally caused by physiologic variations in the development of sebaceous glands in the mucous membranes of the external genitalia, and may be related to androgen stimulation during puberty. Mostly seen in adult men, patients usually manifested cap pinhead size pale white papules, scattered or dense, painless and itchy, can be clearly diagnosed through pathological tissue examination and so on. Patients should pay attention to rinse the foreskin with warm water on time, and at the same time need to pay attention to choose soft and breathable underwear. If the patient is accompanied by itching and other symptoms, it may be caused by fungal infections, and can be treated with external miconazole cream. Transparent pimples on the foreskin are painless and itchy, and it is generally recommended that patients pay more attention to personal hygiene, and other symptoms of discomfort in time to consult a doctor.