1. common warts: common warts are caused by human papilloma virus infection, common in children, young adults and immunocompromised people, this virus invades the skin, will induce the proliferation of epithelial tissue, so that the epidermis thickening keratinization, skin color or brown papules. 2. Molluscum contagiosum: This is a skin disease caused by molluscum contagiosum virus infection, children mainly through public facilities, the main symptom is, the appearance of hemispherical papules 3~5mm in diameter in gray or pearl color. 3. Dermatoid cysts: dermatoid cysts are common in children, often appear in the eyes, eyebrows and nose and other parts of the body, which is caused by abnormal development of skin tissues during fetal development, the main manifestation of painless subcutaneous nodules, not too obvious symptoms. Children with small meatballs, there may be other reasons, it is recommended to go to the hospital, the consultation by the doctor to clarify the cause of symptomatic treatment, to avoid delaying the condition.