Infants scratching their ears all the time may be caused by excessive cerumen, mosquito bites, eczema of the outer ear and other factors. 1. Excessive cerumen: Excessive cerumen in the ears of infants, blocking the ears may lead to ear discomfort, which may cause infants to scratch their ears frequently. 2. Mosquito bites: In summer, there are more mosquitoes, parents do not take care of the ear area by mosquito bites, may appear itchy symptoms, which can lead to infants often scratching the ear, the local redness, mild swelling and other symptoms. 3. Eczema of the outer ear: infants in a long time in a humid and hot environment, may lead to eczema of the outer ear, causing a little itching of the outer ear, infants will frequently scratch the ear. Infants are always scratching their ears, and accompanied by other obvious abnormalities, parents should take their children to the doctor for examination and treatment in a timely manner to avoid delays in the condition.