1. This disease, also known as papular dermatitis in children, is a common skin disease in preschool children in the summer and autumn. 2, the disease may be related to certain objects contact or friction, such as playing with mud and sand, crawling on carpets or blankets, etc.. 3, the clinical manifestations are: the back of the hand, wrist at the most common, the form of a pinhead to the size of a grain of rice, normal skin color or light red round papules, the number of more, a mild moss-like changes. No obvious special discomfort. The following chart: 4, treatment: avoid contact with external adverse stimuli, pay attention to supervision when playing, avoid contact with too dirty objects, can be used externally furnace glycerin, glucocorticoid ointment, or oral anti-allergy drugs.