Infection of the lower extremities is a common lesion in middle-aged and elderly people, with localized redness, swelling and pain in the lower extremities as the main lesion. Most of these patients have an episode of lower extremity dermatitis or acute cellulitis. After surgical antibacterial and anti-inflammatory treatment, the disease turns into chronic cellulitis and edema, with intermittent flare-ups, localized heat sensation and dark red pigmentation, which is called “root of the disease” by the common people. Recurrent lower extremity infections and edema are more common in the elderly, in sub-healthy people, and in patients with combined chronic diseases such as diabetes. This root of the disease cannot be cured by any antibiotics. Once the patient is overworked or drinks alcohol or consumes spicy food, it will flare up and the disease will extend for years in long cases, causing much inconvenience to life and work. The Chinese medicine believes that the disease is damp heat injected in the limbs, mostly by the “Yin deficiency fire” body or “blood heat” caused by the person, treatment is like a bicycle wheel axle grease, very difficult to wipe. Antibiotics are not effective in such an environment. We often use Chinese herbal medicine to clear heat and detoxify, cool the blood and open the ligaments in the clinic, so that the drug can reach the disease directly, while regulating the “Yin deficiency and fire” constitution or “cool the blood and detoxify”, so that the local rapid anti-inflammatory. Based on this treatment, some patients who have not been cured for years have been treated more thoroughly.