The skin on the neck like chicken skin is considered to be keratosis pilaris, the cause of which is unknown, and may be related to autosomal dominant inheritance, vitamin A deficiency, metabolic disorders, and endocrine factors. 1. Autosomal dominant inheritance: If one of the parents has keratosis pilaris, his offspring will have the chance to suffer from keratosis pilaris. 2. Vitamin A deficiency: It is currently believed that vitamin A deficiency can occur due to partiality, picky eating, and unbalanced diet. 3. Metabolic disorders: metabolic disorders are also related to the development of keratosis pilaris. 4. Endocrine factors: patients treated with glucocorticoids or hypothyroidism can develop damage or aggravation of perifollicular keratosis, suggesting that endocrine factors may be related to the disease. Usually this disease does not need treatment, currently incurable, if you have any discomfort, you can go to the regular hospital dermatology department, follow the doctor’s instructions for reasonable treatment to improve the symptoms.