The human ear is rich in blood flow and ear heat and redness may occur in the following situations: 1. When a person is nervous or emotionally excited, the capillaries in the ear will expand and the ear will become hot and red. The symptoms of fever and redness in the ears can also occur when the blood flow increases, and will gradually improve after a period of time indoors. 3. Pathological conditions, such as an infection of the skin of the ear, can also cause redness, swelling, heat and pain, and local anti-infection treatment should be given to effectively treat the symptoms of fever and redness.