Most of the eczema in the external ear canal of children is caused by external factors such as milk, tears and bath water entering the external ear canal and stimulating it to cause eczema, as well as their own allergic factors that can easily cause eczema. When eczema in the external ear canal occurs in infants and toddlers, the lighter ones mostly show various anti-itching actions including shaking their heads, patting their brains or patting their ears because of itching, and some of them bleed inside the ear canal because they keep scratching their ears and have a small amount of blood scabs, etc. At the same time, the child is also irritable and restless and cannot sleep well. If there is secondary infection, there will be running water from the ear canal, ear pain, and fever, and the secondary infection will require further treatment.