1, pseudomonal warts, also known as fluffy labia minora: mostly seen in 20-30-year-old women, mainly in the two sides of the inner labia minora and vaginal vestibule. Some of them are filiform, papillary or polypoid. Patients mostly have no conscious symptoms, and a few feel localized itching. The acetic acid white test is negative. 2, penile pearly papules: mostly seen in men around 20-30 years old. It mainly occurs at the junction of the glans and the coronal sulcus and at the tether. The rash is 1-3mm sized papules, rounded and smooth at the tip, individual papules are hairy or filiform. They are not fused with each other and are densely arranged in one or more rows. Most of them are pearly white, a few are light red and skin-colored, and some may appear mildly red and swollen. There is no pressure pain, no rupture, and the patient has no self-conscious symptoms. The white acetate test is negative. 3, sebaceous gland ectopic disease: is a sebaceous gland disease, due to the physiological variant of sebaceous gland development and sebaceous gland hyperplasia. It is more common in middle-aged people, and is more common in men than women. It occurs on the lips of the mouth, penis and labia. The rash is a flat, corn-sized papular lesion with no obvious elevation, distributed in clusters, mostly yellowish or a few pale white, partly fused into dense irregular-shaped patches, with a smooth surface, which is more clearly visible when the skin is tensed and has a fine mud-like sensation when touched. The damage is mostly without conscious symptoms. The white acetate test is negative. The above three diseases generally do not need treatment, if the patient strongly requested treatment can be used laser, freezing and other physical treatment methods.