Pimples on children’s faces can be caused by allergies, eczema, immunodeficiency disorders and other conditions. 1. Allergy: Children’s faces with many small pimples may be due to allergic conditions, usually related to children’s diet or airborne dust and other allergens. 2. Eczema: Inadequate hygiene and cleaning of the skin surface of the face and persistent irritation from secretions, sweat and dirt may also lead to pimples on the face of children. 3. Immunodeficiency diseases: lupus erythematosus, Behçet’s syndrome, mycosis fungoides, etc., may affect the child’s immune system, which may lead to the child’s face with a lot of pimples. Children’s face a lot of pimples may also have other causes, it is recommended to go to the hospital in a timely manner, to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.