It is a precancerous lesion that occurs mostly in squamous epithelial tissues and is commonly seen in elderly people over 40 years of age, especially those who are exposed to the sun. It is usually found in exposed and friction-prone areas such as the head, sacro-caudal area or back, but also in the hands, penis and eyelids or on the basis of other skin diseases. These two cases occurred in the auricle. Rarely, the lesions are shaped like horn-like keratinous redundancies of a few millimeters to several centimeters in length in animals such as cattle and sheep horns. The base was flushed or had no obvious inflammatory manifestations, while case 1 had significant pain and itching, and the possibility of carcinoma should be considered, so a wedge-shaped excision of the auricle was performed. Histopathologically, there are various pathological changes in the horn of skin, the most common being solar keratosis, others showing filiform warts seborrheic keratosis, entropic follicular keratosis, squamous cell carcinoma, and occasionally basal cell epithelioma. The treatment should be early surgical excision, if there is no cancer, simple superfluous excision is feasible, and most of the lesions can be rotated or free flap method to prevent auricular deformity and scar formation. The common primary diseases are seborrheic keratosis, inverted follicular keratosis, actinic keratosis, squamous carcinoma, etc. If the base of the skin angle is congested with redness and infiltration, it is a precursor of malignant change. The development of the lesion is slow and there are generally no conscious symptoms. About 12%-13% of lesions develop into invasive squamous cell carcinoma, but metastasis is extremely rare, so early diagnosis and treatment are needed.