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There are cases where itching arises from blood heat, from excessive toxicity, or from contracting wind pathogen. These three types are suitable for treating with Xiaodu San (Detoxification Powder) added with Fangfeng (Saposhnikovia Root), Lianqiao (Forsythia Fruit), Xuanshen (Scrophularia Root), Chan Yi (Cicada Slough), Digupi (Lycium Bark), Shengdi (Rehmannia Root), Huangqin (Scutellaria Root), and Jingjie (Schizonepeta Spike). It is also said: When itching occurs, one should promptly disperse wind to open the cou-li (skin pores), and attack toxicity to unblock stagnation, thereby stopping the itch.

It is further stated: Heat-toxin congests in the skin, qi mechanism is depressed, and blood is scorched. Qi is not deficient; when constrained, it flares like fire. Blood is not inherently hot; when scorched, it becomes urgent. As qi and blood circulate within the flesh and skin, this is why itching arises. One should increase the dosage of Shigao (Gypsum Fibrosum) and Shengdi (Rehmannia Root) to cool and resolve, thereby suppressing the momentum of heat-toxin. In this way, qi and blood will not suffer from evil influence, and what worry is there regarding itching? If internal symptoms are rampant and feces are dry and constipated, use Dahuang (Rhubarb Rhizome), Mahuang (Ephedra Herb), and Zhike (Aurantium Fructus) to rapidly purge accumulation. One must not wait until thirsty to dig a well (i.e., act too late). There is also a folk method: boil Shengma (Cimicifuga Rhizome), Cangzhu (Atractylodes Rhizome), Sangbai (Morus Root Bark), Jingjie (Schizonepeta Spike), Fangfeng (Saposhnikovia Root), Liuzhi (Willow Branch), and Huaizhi (Sophora Branch) in water, and wipe the affected area with a cloth soaked in the decoction; the itching will cease.

After the eruption of rashes, if diarrhea occurs accompanied by pus and blood in the stool, this indicates that evil heat has sunk inward. Astringent and binding agents are strictly contraindicated; instead, lifting and dispersing methods are most appropriate. Although it is often said that clear qi fails to ascend and spleen-stomach is weak, one should not lightly use Shengdi (Rehmannia Root). By resolving the heat and cooling the blood, all symptoms will heal spontaneously. The treatment of rashes differs significantly from other diseases; it should primarily focus on clearing heat, dispersing outward, and cooling the intestines. Stool consisting purely of blood indicates wind damaging the liver; dispersing wind and cooling blood is indicated. Stool resembling bean juice indicates dampness damaging the spleen; clearing heat and leaching out dampness is primary. If fresh blood appears, it is known as Changfeng (Intestinal Wind), appearing upon contraction of pathogens; if dark clotted blood appears, it is Zangdu (Visceral Toxin), erupting after long-term accumulation. Bleeding before defecation is Jin Xue (Near Blood), originating from the stomach and intestines; bleeding after defecation is Yuan Xue (Far Blood), originating from the lungs and liver. Medications must avoid sour and astringent flavors. If seen after rashes, this indicates heat transferring to the large intestine; medications should descend. Subsequently administer Huaijiao (Styrax Seed), Chuanlian (Coptis Rhizome), Shigao (Gypsum Fibrosum), Mutong (Akebia Caulis), Liuyi San (Six-to-One Powder), Shanzhi (Gardenia Fruit), Huangqin (Scutellaria Root), and Xingren (Apricot Seed). Over time, Diyü (Sanguisorba Root) yields similar effects. The *Classic* states: "The kidney is the gate of the stomach." The kidney governs the two lower orifices. Prolonged diarrhea leads to kidney deficiency; one cannot solely blame the spleen and stomach. When rash toxin transmits to the large intestine, causing dysentery with pus and plasma, this represents the transmission from zang organs to fu organs. Knowing the cause ensures recovery and health.