Rough skin on the chin with a sense of abrasion is mostly considered to be perifollicular keratosis, the etiology of this disease is not known, may be related to autosomal dominant inheritance, vitamin A deficiency, metabolic disorders, etc., commonly found on the face, the lesions are manifested as a needle tip to grain size follicular papules, skin color, not fusion, skin with a sense of roughness, there are often no self-awareness of the symptoms, and sometimes there can be a sense of micro-itching. 1. Autosomal dominant inheritance: most of the perifollicular keratoses have a certain genetic predisposition, if the father or mother has perifollicular keratoses, then their offspring are also prone to perifollicular keratoses. 2. Vitamin A deficiency: If the body does not take in enough nutrients due to long-term picky eating and irregular diet, resulting in vitamin A deficiency, it is also easy to cause Keratosis Pilaris. 3. Metabolic disorders: If you have metabolic diseases such as diabetes, you may suffer from this disease. Another hypothyroidism, Cushing’s syndrome and glucocorticoid treatment of people with high incidence and severe skin lesions. It is recommended that patients go to the dermatology department of a regular hospital, after a clear diagnosis, follow the doctor’s instructions and timely treatment to avoid delay.