A lot of small bumps on the forehead of the baby may be prickly heat, baby eczema or contact dermatitis and other skin diseases. 1. Prickly heat: in summer or hot and humid areas, due to more sweating and poor perspiration leads to the occurrence of prickly heat, appearing in the face, trunk and other places of dense rounded tip of the papules or mounds of herpes, surrounded by a red halo, accompanied by itching, can leave scales and then fall off. 2. Infantile eczema: it can be related to heredity, environment, diet and other factors, it can appear bright red erythema on the face, forehead and other places of the affected children, followed by dense papules and blisters, which cause intense itching, and after friction, vesicles can be formed. 3. Corns: tiny epidermoid cysts, damage to the face, forehead, temporal and other places of yellowish-white or white hard small papules, the surface is smooth, can be self-shedding. When the baby forehead dense pimples, need to consult a doctor in time, clear cause, follow the doctor’s instructions for symptomatic treatment.