The outside of the ear should refer to the skin at the auricle, and a large amount of dandruff in the auricle may be caused by atopic dermatitis, auricular eczema, seborrheic dermatitis and other causes. 1. Atopic dermatitis: it is a chronic inflammatory skin disease associated with genetic allergic qualities, manifested by itching, polymorphic lesions and tendency to exudate, which can be manifested by dandruff when it occurs in the outer ear. 2. Auricular eczema: if some patients come into contact with allergens, it will lead to allergic skin diseases, such as the formation of eczema-like skin lesions, which may also appear in the auricle of a large number of dandruff. 3. Seborrheic dermatitis: the sebaceous glands of the outer ear are overproducing and there is a chronic, recurrent, inflammatory skin disease in the seborrheic area, which may also cause a lot of flakes in the auricle. If there is a lot of skin on the outside of the ear, you should actively seek medical attention to clarify the diagnosis.