Rough skin on the arms like goose bumps is mostly a symptom caused by keratosis pilaris. Keratosis pilaris is a chronic follicular keratosis pilaris, the cause of which may be related to heredity, vitamin A deficiency, metabolic disorders and so on. Perifollicular keratosis is mainly manifested as small reddish or normal-skinned papules with chicken skin-like appearance and rough skin, which occur symmetrically on the anterior side of the thighs or the lateral side of the upper arms, and may also occur on the cheeks, buttocks, and calves. The symptoms of keratosis pilaris are usually seasonal, with lesions often worsening in winter and having relief in summer. There may be other causes of rough skin on the arms, it is recommended to go to the hospital in time, complete the examination to clarify the cause of the disease, and then give targeted treatment or therapy.