The walnut coat in the title should refer to the Chinese herbal medicine Qinglongpi, which has the effect of relieving pain, detoxifying and subduing swellings, and its contraindications are still unclear, but it should be noted that Qinglongpi is prohibited for those who are allergic to it. Qinglongpi belongs to the swelling and itching medicine, for the walnut family plant walnut dry flesh rind, taste bitter, astringent, flat. Qinglong Pi has the efficacy of relieving pain, detoxification and swelling. Qinglong Pi is commonly used clinically for the treatment of stomach and abdominal pain, watery diarrhea, carbuncle, swollen sores and poison (generally due to bacterial infections caused by the disease, usually manifested as a lump on the skin, accompanied by obvious pain sensation in the skin, can appear pus), stubborn ringworm and so on. The adverse reactions and contraindications of Qinglongpi are not clear, but it should be noted that Qinglongpi is contraindicated for those who are allergic to Qinglongpi. If necessary, please use under the guidance of a professional Chinese medicine practitioner.