Baby forehead grew a lot of small particles neonatal acne, infantile eczema, contact dermatitis, prickly heat and other diseases caused. 1. Neonatal acne: This disease is mainly caused by the excessive secretion of androgen levels in the affected child’s body, which may be related to the abnormal secretion of maternal hormones or itself. Usually in the early stage of the disease, the surface of the skin will appear corn-like size pimples, part of the visible dust, mostly in the forehead. 2. Infantile eczema: the etiology of this disease is not yet clear, mainly related to genetics, often triggered by the environment, improper complementary foods, excessive cleaning of the skin and other factors. Symmetrical erythema, papules, blisters and other symptoms will appear on the face and head of the affected children, which can be manifested as a lot of small particles on the forehead of the affected children. 3. Contact dermatitis: this disease is caused by skin contact with allergens, such as animal dander, dust, dust mites, care products. The lesions are mostly confined to the contact area, and localized pinpoint-sized dense papules will appear, so the child has a lot of small particles on the forehead, accompanied by itching, burning, swelling and pain and other symptoms. 4. Prickly heat: research shows that prickly heat is mainly caused by the obstruction of sweat ducts, hot and humid environment is a common cause of morbidity, and, secondly, with the development of sweat ducts, long-term bedridden, ultraviolet radiation and other factors. Typical symptoms are the child’s forehead, neck, armpits and other places will appear distribution of dense papules or mounds of herpes, so the baby forehead grew a lot of small particles may be prickly heat. There are many reasons why babies grow a lot of small particles on the forehead, need to do the relevant examination to clarify the specific cause of the disease with the doctor for standardized treatment.