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Yin sores (Yin Chuang) can be generally categorized into three types: one is dampness-related yin sore; the second is jealousy-induced sore (Du Jing Chuang); and the third is erosive yin sore, also known as chancre (Xia Gan Chuang).

Dampness-related yin sore arises from weakness in the Kidney Meridian, where wind-dampness combats each other, allowing pathogenic factors to invade. Scratching leads to sores that exude fluid and sweat, resembling scabies (Jie Chuang). Jealousy-induced sore occurs when a young man with abundant essence and qi abstains from sexual activity for a long time, causing sores to grow on the genitals, characterized by redness, swelling, harm, irritability, itching, and pain. Erosive yin sore results from deficiency and pathogenic invasion of the Kidneys, with heat binding in the Lower Jiao, causing obstruction and stagnation of meridians and non-circulation of Qi and Blood. It may also stem from excessive sexual activity or unclean bathing. If left untreated due to endurance, swelling becomes severe. Since the sore is deep within, it is difficult to treat, leading to pain, distension, symptoms resembling strangury (Lin Zheng), and swelling and pain of the testicles. After ten days or more, it may ulcerate with bloody pus, erode muscle tissue, or cause continuous bleeding, forming a chancre. If accompanied by high fever, irritability, thirst, and aversion to cold, urgent treatment is required. Soak the area with Da Dou Gan Cao Tang (Soybean and Licorice Decoction) or bathe with Zi Du Tang (Poison-Soaking Decoction). Internally administer Wu Xiang Lian Qiao Tang (Five-Spice Forsythia Decoction) or Lou Lu Tang (Euphorbia Decoction) to dredge and drain. Apply Jie Gan Di Sheng San (Chancre-Cutting and Sainthood-Reaching Powder) dry to the lesion, and use Mo Feng Gao (Wind-Rubbing Ointment) around the periphery to moisten and warm. Subsequently, observe dietary and lifestyle precautions. For persistent thirst, take Zhu Ye Huang [missing character] Tang (Bamboo Leaf and [Missing] Decoction); for soft stools, take Tuo Li Fu Ling San (Support-Interior Poria Powder) for regulation. In this manner, recovery is assured.

Shi Du (Seasonal Toxin) is caused by the infection of pathogenic toxic qi from the four seasons. Its manifestations appear on the nose, face, ears, neck, and throat, presenting as redness and swelling without a head, with nodules rooted deeply. It causes chills, fever, headache, and limb pain. Severe cases lead to mental confusion, restlessness, and throat obstruction. Unaware of the condition, people often mistake it for Tai Yang Disease (Tai Yang Bing) and take exterior-releasing medicines. After one or two days, the swelling increases, at which point they realize their error and summon a surgeon. Historically, there were no specific formulas or discussions for this disease in ancient texts. The common people usually call it Dan Liu (Dan Nodule). Patients' families dislike the term "Shi Du" due to fear of contagion. Medical classics state: sudden reddening of the body, looking like painted cinnabar, is called Dan Du (Erysipelas). This is caused by wind-heat and evil toxins, termed Dan Liu, which is distinctly different from Shi Du! Shi Du results from contracting abnormal qi of the four seasons. Initially, it resembles Tai Yang Disease, but can be fatal between the fifth and seventh days. Treatment requires precise differentiation. First, diagnose the pulse: Slippery (Hua), Rapid (Shu), Floating (Fu), Surging (Hong), Deep (Chen), Tight (Jin), Wiry (Xian), and Choppy (Se) are all indicators. A Floating-Rapid pulse indicates pathogenic factors in the Exterior; a Deep-Choppy pulse indicates deep-seated pathogens. For patients with substantial Shi Du pathogenic qi, urgently administer Hua Du Dan (Toxin-Transforming Pill) to attack the pathogen. For excess heat, use Wu Li Da Huang Tang (Five-Benefits Rhubarb Decoction) to purge downward. For those with Exterior syndromes, use Jie Du Da Huang Tang (Detoxifying Rhubarb Decoction) to release the exterior. For the elderly with weak Qi, primarily use Wu Xiang Lian Qiao Tang. Additionally, blow Tong Qi San (Vent-Qi Powder) into the nostrils until more than ten sneezes occur, indicating efficacy. If the patient does not sneeze after medication, the condition is incurable. If pus and blood are expelled via sneezing, the treatment will surely succeed. Attendants should use the powder daily to induce sneezing to prevent contagion. The patient should use the sneezing powder three to five times daily to vent heat and toxin; this is an excellent method for treating Shi Du. If unresolved after three or four days, do not purge severely; instead, harmonize using Xi Jiao Lian Qiao San (Rhinoceros Horn and Forsythia Powder). By the seventh or eighth day, if urination and defecation are free and the head/face are swollen, red, and elevated, administer Tuo Li San (Support-Interior Powder) or Huang [missing character] San (Astragalus Powder). Prick the area with needles, lancets, or bi stones to bleed out and vent the toxic qi. After ten days, it may heal spontaneously. If, before the fifth day, the patient exhibits mental confusion, throat obstruction, inability to speak, lack of head/face swelling, and loss of taste, it is a death omen, and treatment will be futile. However, this disease has Yin and Yang aspects, and treatments may involve sweating or purging. I have seen incompetent physicians attribute it solely to heat toxin and use only cold medicines, failing to understand that diseases vary in severity and treatments must follow either counteracting or following principles.