Cornular papules are a common skin disorder that is usually benign, without any spontaneous symptoms, and therefore does not require treatment. It can be triggered by a variety of causes because of the concomitant symptoms of a variety of diseases, so how to make a differential diagnosis of milia? 1, rosacea: In addition to erythematous papules on the face, the tip of the nose and cheek capillaries are dilated erythematous. The mouth of the follicle is often enlarged. Late nasal redundancy formation, often accompanied by seborrhea. 2.Common pimples: There are many kinds of lesions, and the face often has blackheads and pimples in addition to papules, pustules, nodules and cysts. The facial sebum secretion is vigorous. 3.Papular necrotizing tuberculosis rash: lesions occur in addition to the face, the extremities and trunk also occur, for symmetrical necrotizing papules. Sebaceous adenoma: scattered yellowish capillary dilated papules or nodules occurring in the central part of the face without conscious symptoms, often accompanied by mental retardation and epilepsy. The papular lesions are creamy white or yellow, pinhead to rice-sized, firm papules with rounded tops, covered with very thin epidermis. Secondary lesions are usually located around the original lesions and may persist for several years, peeling off spontaneously without scar formation. Individual lesions may have calcium salt deposits, hard as cartilage, and dark yellow when the lesions increase in size. They are most often seen on the face, especially on the eyelids, cheeks, and forehead. It can also occur on the genitalia in adults and is usually limited to the eyelids and temporal region in infants. Symptoms of acne include pimples, blackheads, and papules. These may appear on the face, neck, shoulders, back or chest. The papules are large and deep and are called pustular lesions. If they become infected, they can be painful. They can likewise scar the skin.