Children’s hands grow a lot of small particles, can be seen in pediatric papulopapular dermatitis, eczema or flat warts and other skin diseases. 1. Children’s papulopapular dermatitis: a characteristic skin lesion after infection with hepatitis B virus, can appear in the limbs of many red flat papules, usually not fusion, and no self-conscious symptoms. 2. Eczema: it can be triggered or aggravated by internal factors (such as infection, heredity) or external factors (food, inhalants, environment, etc.), and can occur in all parts of the body, manifesting as erythematous spots, millet-sized pimples or herpes papules and other polymorphic lesions. 3. flat warts: for the skin mucous membrane infected with human papillomavirus benign superfluous organisms, will be in the face of the children, the back of the hands and other places appear flat elevated pimples, the surface is smooth, the texture is hard. If a child has pimples on his hands or other parts of the body, it is advisable to consult a doctor and follow his instructions.