Lower limb erosion refers to the occurrence of chronic skin ulcers in the lower limbs, chronic ulcers of the lower limbs belong to the Chinese medicine “Polycarbonates” category. 1. Etiology and pathogenesis: this disease is mostly due to congenital insufficiency, the lowering of the central qi (spleen and stomach qi deficiency, viscera and organs fall, etc.), resulting in the tendons and veins flaccid and weak; coupled with the loss of nourishment after birth, such as prolonged walking, standing and sitting, fatigue and injury to the gas, resulting in the lower limbs of the qi and blood to run weak, or wet and stagnant stagnation of the long-standing transformation of heat, damp-heat and poisonous evils congested the lower extremities, heat and flesh, blood and flesh corruption and become. 2. Chinese medicine diagnosis: Damp-heat toxic syndrome is characterized by local ulceration, foul smell, swelling and burning of the skin around the trauma; Damp-heat stasis and obstruction (dampness and heat gathering to form stasis) syndrome is characterized by local itching and erosion of the trauma; Qi deficiency and blood stasis syndrome is characterized by the pale white or purple flesh on the trauma surface, dark skin color, stagnation and hardness of wood; Spleen deficiency and dampness is characterized by the long course of the disease, the traumatic granulation of dark flesh and swelling, or pus and moss attached to the trauma surface. 3 Treatment methods (1) Traditional Chinese medicine treatment: for Damp-Heat-Toxin-containing syndrome, Si-Miao Yong-An Tang can be taken to clear heat and toxins (remove heat and toxins from the body), and harmonize the camps and promote dampness; for Damp-Heat-Stagnation syndrome, San-Miao Pill can be taken to clear heat and promote dampness, and remove blood stasis and open the collaterals; for Qi and Blood-stasis syndrome, Yang-Renewal Tang can be taken to promote Qi and blood circulation, and remove blood stasis and promote the development of new cells; for Spleen Deficiency-Dampness syndrome, Ginseng-Ling-Baijutsu-San can be taken to strengthen the spleen and promote dampness. (2) Traditional Chinese Medicine (TCM) external treatment: Silkworm cleaning, Chinese herbal medicine paste therapy, wrapping therapy or moxibustion therapy can be used for treatment. All the above treatments should follow the doctor’s prescription.