Red dots on the baby’s face may be caused by heat rash, atopic dermatitis, purpura and other causes. 1. Heat rash: when the weather is hot, the human body is more prone to sweating, if the sweat can not be discharged in a timely manner, it can accumulate in the baby’s skin, which can cause an inflammatory reaction of the skin, appearing pinpoint-sized pimples. 2. Allergic dermatitis: baby eating fish, shrimp or contact with pollen and other allergens, can cause the body to undergo an abnormal immune response, which can be manifested in the face of the long red dots. 3. Purpura: due to crying and other factors can cause the baby face capillary rupture, subcutaneous hemorrhage, can be manifested as red dots on the face. Baby face long red dot there are other reasons such as contact dermatitis, insect bite dermatitis, etc., it is recommended that parents take their babies to the hospital in a timely manner, a clear reason, and then on the cause of the standardized treatment, do not blindly use medication, in order to avoid delays and even aggravate the condition.