疹乃热也。不可用人参、白术，当理血而不宜散血。疹初起必发热口渴，状如红云一片
，与斑相同。但斑无头粒而疹有头粒，如虫咬之状。用元参三钱，当归二钱，升麻五分，甘
草五分，葛根一钱，水煎服。心火加黄连三分，肝火加栀子六分，肺火加黄芩、麦冬各一钱
又方∶生地、牛子、丹参各三钱，荆芥、防风、木通各钱半，石斛、连翘各二钱，紫草
绒、蝉蜕、郁金、犀角各一钱，西河柳叶五钱（又名观音柳），水煎服。此叶天士先生方也，
屡试如神。西河柳能达皮肤，非此不效，体虚者少服。
巴豆五十粒（去皮），煮浓汁，以布蘸抹，即愈。
名血风疮。老南瓜（北人呼为倭瓜），去皮，煮烂，布包挤去水，浓浓敷之，三日收功。
门）敷
又方∶枫子肉、蛇床子各五钱，枯矾、点铜锡各一钱，共为末，加水银二钱，和生猪油
捶融搽之。并治坐板疮及癣疮、虫疮，其效甚速。
苦参四两，大菖蒲二两，河水五瓢同煎数沸，添水二瓢、盖片时，临洗和入雄猪胆汁四
五枚，洗之，避风，甚效。或照各前方治之。
明雄黄研细，苍术研细各一两，松香二两，先将松香溶化，以虎爪和各药末为丸如弹子
大，夜烧火笼中，令病患坐其上，以被蒙住，露头在外，扶住熏之，连熏三夜，邪物自去。
愈后，必然泄泻，多服平胃散（见内外备用诸方），自愈。内有苍术最能避邪，此仙方也。
终
Rashes are caused by heat. Ren Shen (Ginseng Radix) and Bai Zhu (Atractylodis Rhizoma) should not be used; one should regulate the blood rather than disperse it. At the initial stage of a rash, there is invariably fever and thirst, resembling a patch of red clouds, similar to macules (flat, discolored spots on the skin). However, macules lack granular protrusions, whereas rashes have them, resembling insect bites. Use Xuan Shen (Scrophulariae Radix) 3 qian, Dang Gui (Angelicae Sinensis Radix) 2 qian, Sheng Ma (Cimicifugae Rhizoma) 5 fen, Gan Cao (Glycyrrhizae Radix et Rhizoma) 5 fen, and Ge Gen (Puerariae Lobatae Radix) 1 qian; decoct in water and take orally. If there is Heart Fire (excess heat in the Heart meridian), add Huang Lian (Coptidis Rhizoma) 3 fen; if there is Liver Fire (excess heat in the Liver meridian), add Zhi Zi (Gardeniae Fructus) 6 fen; if there is Lung Fire (excess heat in the Lung meridian), add Huang Qin (Scutellariae Radix) and Mai Dong (Ophiopogonis Radix) each 1 qian.
Another prescription: Di Huang (Rehmanniae Radix), Niu Bang Zi (Arctii Fructus), and Dan Shen (Salviae Miltiorrhizae Radix) each 3 qian; Jing Jie (Schizonepetae Spica), Fang Feng (Saposhnikoviae Radix), and Mu Tong (Akebiae Caulis) each 1.5 qian; Shi Hu (Dendrobii Caulis) and Lian Qiao (Forsythiae Fructus) each 2 qian; Zi Cao Rong (Arnebiae Radix et Rhizoma), Chan Tui (Cicadae Periostracum), Yu Jin (Curcumae Radix), and Xi Jiao (Rhinocerotis Cornu) each 1 qian; Xi He Liu Ye (Tamarisci Ramulus, also known as Guanyin Liu) 5 qian; decoct in water and take orally. This is a formula from Mr. Ye Tianshi, which has proven miraculous in repeated trials. Xi He Liu can penetrate the skin; without it, the treatment is ineffective. Those with weak constitutions should take a reduced dose.
Ba Dou (Crotonis Fructus) 50 grains (peeled), boiled into a thick juice, applied to the affected area with cloth, will result in immediate cure.
Can Sha (Bombyx Batryticatus) 1 sheng, boiled in 5 dou of water until reduced to 1.2 dou; strain the dregs and bathe in the liquid, avoiding wind.
This condition is named Xue Feng Chuang (Blood-Wind Itch, a skin disease caused by blood deficiency and wind-dryness). Old pumpkin (called Wo Gua in the North), peeled, boiled until soft, wrapped in cloth, squeezed to remove excess water, and applied thickly to the lesion, will achieve results in three days.
Another prescription: Feng Zi Rou (Seed flesh of Liquidambar formosana) and She Chuang Zi (Cnidii Fructus) each 5 qian; Ku Fan (Alumen) and Dian Tong Xi (a type of copper-tin alloy) each 1 qian; grind together into powder, add 2 qian of Mercury (Shui Yin), and mix with fresh pig lard by pounding until fused; apply externally. This also treats So Ban Chuang (Saddle Sore, eczema of the buttocks), Xuan Chuang (tinea), and Chong Chuang (insect-bite dermatitis), with very rapid effects.
Hua Shi (Talcum) 5 qian, Lu Dou (Phaseoli Semen) 4 liang, ground into powder, lightly stir-fried, mixed evenly, and dusted onto the affected area using cotton.
Ku Shen (Sophorae Flavescentis Radix) 4 liang, Da Chang Pu (Acori Tatarinowii Rhizoma) 2 liang, decocted in 5 ladles of river water until boiling several times; add 2 ladles of water, cover, and let steep for a while; before washing, add 4-5 gallbladders from male pigs; wash the affected area, avoiding wind. This is highly effective. Alternatively, treat according to the preceding formulas.
Ming Xiong Huang (Realgar) ground fine, Cang Zhu (Atractylodis Rhizoma) ground fine, each 1 liang; Song Xiang (Pini Resina) 2 liang. First melt the Song Xiang, then use a tiger-claw tool to mix it with the powders of the other herbs to form pills the size of marbles. At night, burn these pills in a fire basket, have the patient sit over it, cover with a quilt leaving the head exposed, and fumigate the affected area while supporting the patient. Continue fumigation for three consecutive nights, and the pathogenic factors will naturally depart. After recovery, diarrhea will inevitably occur; taking Ping Wei San (Calm the Stomach Powder, see miscellaneous formulas) frequently will lead to spontaneous healing. Cang Zhu is particularly effective at repelling pathogens; this is considered an immortal formula.