Keratosis pilaris is a physiological keratotic skin change. It is mainly related to genetics. Keratosis pilaris disease characteristics: 1. The lesions are mostly pin-cap sized follicular papules, normal skin color or light red. The papules are tipped with keratinous plugs and contain curled fine hairs. There are tiny depressions when the pimples are removed. However, the horn embolus will be formed again soon. 2. It occurs on the extensor side of both upper limbs, lateral femur and buttocks. It can also be seen on the shoulder. 3.Common in adolescents, especially those with rapid weight gain in a short period of time. It improves in adulthood. 4.Reduces in summer and worsens in winter. Generally no conscious symptoms. Treatment: 1. Systemic treatment. Keratinization obvious can be oral vitamin A 50,000 units, three times a day. 2, local treatment. Topical application of 10% urea cream, 0.1% vitamin A acid cream, 10% cod liver oil ointment, etc.