Elevated skin temperature is commonly associated with erythematous limb pain. Erythermalgia is a disease caused by excessive vasodilatation of the blood vessels in the extremities, which is characterized by paroxysmal redness of the extremities, increased skin temperature and burning pain in a warm environment. Primary cases are more common. The disease is rare. Most patients are children or 40 years old. Overseas reports show that there are more male patients than female patients, about 2/1. However, among the 433 cases reported in Guangzhou, young females accounted for 92.86% of the cases, and the male/female ratio was 1/13. The disease has a rapid onset, and attacks are often triggered or aggravated by dropping the limb, standing or exercising in a warm environment. Localized skin temperature exceeding the critical temperature often causes an attack, and the attack is often more severe at night than during the day. Seizures are characterized by symmetrical, paroxysmal severe pain in both feet, which is mostly burning, occasionally tingling or swelling. The skin is flushed and congested, and the skin temperature increases with sweating. The dorsalis pedis and posterior tibial artery pulsations are enhanced. Cold compresses, elevation of the affected limb or exposing the foot to the blanket, and local temperatures below the critical temperature may relieve the attack and return the skin color to normal. The pain is usually confined to the bunions and toes of the foot, and less commonly to the corresponding parts of the hand. Each attack lasts a few minutes or even a few hours and is occasionally accompanied by localized edema. Between episodes, mild numbness or pain often remains in the extremity, but without neurotrophic disorders such as ulcers or gangrene. Patients are advised to wear porous sandals, the foot should not be covered at night while sleeping, and the foot should be avoided exposure to warm environments, especially dry heat. Those with severe attacks can move to live in a place where the temperature does not reach below the critical temperature for causing pain attacks. However, it is also not advisable to use ice or ice water local cooling method to relieve the attack, so as not to damage the blood vessels of the extremities and peripheral nerves, but to make the attack continue or aggravate. Recommended formula: frankincense 10g, myrrh 10g, peach kernel 10g, safflower 10g, angelica 15g, astragalus 30g, silver flower 30g, red peony 12g, cypress 15g, xuan shen 30g, salvia 15g, numbness, swelling and pain in the case of add white peony 15g, licorice 10g, tongue bruising in the case of add hematoxylin 15g, Liu Shunu 30g, yellowish greasy tongue plus Cangzhu 12g, Coix seed 30g. The above prescription with water 1000ML, decoction to 400ML, filter, then add water 500ML, decoction to 200ML, filter, the third decoction add water 500ML, decoction to 200ML, filter, the three decoction blended together, mix, and divided into three times to serve, children under 12 years old reduce by half.