External auricle itching, redness, swelling and fever may be associated with mosquito bites, external ear eczema, contact dermatitis and other diseases. 1 mosquito bites: ear by mosquito bites , stimulate the ear local skin redness and swelling, auricle itching, fever symptoms. 2. External auditory canal eczema: refers to the external auditory canal skin metamorphosis inflammatory disease caused by various factors. Its typical symptoms are papules, vesicles, plasma exudation, etc., itching, redness, swelling and fever in the outer ear. 3. Contact dermatitis: auricle contact with external allergy-inducing substances or irritating substances, resulting in a perverse reaction, will cause redness, swelling and itching of the external auricle of the ear. If there are symptoms of itching, redness, swelling and fever of the external auricle of the ear, it is recommended to consult the hospital for diagnosis and treatment.