Itchy thickening of the auricle may be related to frostbite, or it may be caused by insect bite dermatitis, eczema and other reasons. 1. Frostbite: especially in the cold winter in the north, if you stay outdoors for a long time, due to the auricle part of the fat is less, a long time by the cold stimulation, is likely to cause frostbite of the auricle skin, which may cause the auricle itchy, thickening, but also with localized ulceration, pain and other symptoms. 2. Insect bite dermatitis: common in hot summer, due to more mosquitoes, if the skin in the auricle area is bitten by mosquitoes, resulting in the toxins of mosquitoes retained in the skin, which may induce insect bite dermatitis, thus causing itchy and thickening of the auricle. 3. Eczema: usually due to a long time in a hot and humid environment, or by ultraviolet rays, pollen, food and other factors caused by stimulation, when the auricle area of eczema, can be in the auricle of the local skin pimples, pimples, accompanied by the phenomenon of redness and swelling, resulting in the itchy thickening of the auricle, but also accompanied by the surface of the skin roughness, localized skin vesiculation and oozing and other manifestations. Itchy thickening of the auricle may also be related to other factors, if the symptoms are serious, should seek medical attention as soon as possible, after clarifying the causes, to give targeted treatment and conditioning.