The common causes of small rashes on infants’ faces are prickly heat, allergic dermatitis, eczema, contact dermatitis, neonatal acne, etc. They appear for different reasons: 1. Prickly heat: babies develop heat rash due to wearing too much clothing or covering too thickly with blankets; 2. Allergic dermatitis: babies’ delicate skin is easily stimulated by the external environment, which leads to skin allergies. For example, contact with dust, pollen, etc., may lead to a small rash on the skin. In addition, if a breastfeeding woman feeds her baby through breast milk after eating beef, mutton, dog meat, seafood, fish, crab and other foods, it may also lead to allergies on the baby’s face; 3. Eczema: It may be caused by an imbalance in the body’s immune function or allergy to external factors, such as direct sunlight, hot and humid air, etc.; 4. Neonatal acne: It is caused by hormonal exuberance and will Gradually disappear, usually 2-3 months, often occurring at the same time as eczema, with blurred rash boundaries, accompanied by itching, sometimes with oozing and crusting; 5, contact dermatitis: caused by prolonged contact with infant skin, resulting in irritation.