Children’s ears are red blood may be due to environmental factors, infections, allergic reactions and other reasons. 1. environmental factors: generally due to local factors stimulation, such as mosquito bites or cold, heat, etc., caused by vasodilatation will lead to the ear a short period of time the situation of red blood. 2. Infection: generally due to local inflammation will stimulate the expansion of blood vessels in the ear, causing the child’s ears localized redness. 3. allergic reaction: generally refers to when the child is allergic to certain allergens will appear blood vessel expansion, congestion, appear ears are red blood situation. Children’s ears are red blood if the long time does not improve and with swelling, pain and other discomforts, should be timely to the regular hospital diagnosis, follow the doctor’s instructions standardized treatment, usually also need to pay attention to the child’s situation, in order to prevent other consequences.