自蛇虱、乌癞、癣疹起，至湿痰流注止，皆汇于此部中，以便检阅参治。
王肯堂曰∶蛇虱遍身起如风疹疥丹之状，其色白不痛但痒，搔抓之起白 。柏
叶一味煎水洗。内服蜡矾丸、金银皂角丸。（《准绳》）
《心法》曰∶白 俗名蛇虱。生于皮肤，形如疹疥，色白而痒，搔起白皮，由风邪
客于皮肤，血燥不能荣养所致。用猪油、苦杏仁等分捣匀，绢包擦。
王肯堂曰∶夫癞疾皆是恶风及犯触忌害所得。初觉皮毛变黑，或淫淫苦痒如虫
行，或眼前见物如垂丝，言语无定，心常惊恐，皮肉之中或如桃李，瘾疹亦黑，手
足顽麻，针刺不觉痛，脚下顽痛不得踏地，凡食之时，开口出气而鸣，语亦如是。身
体生疮，痛痒而时如虫行，或两肘如绳缚，此名乌癞。又有黑癞。凡二癞之证，大同小异，故不别录也。（《准绳》）
又曰∶白癞者其语声嘶嗄，目视不明，四肢顽痛，身体大热，心中懊恼，手足缓
纵，背膂拘急，内如针刺；或生瘾疹而起，往往正白在皮肉，鼻有息肉，目生白珠挡
于瞳子，视无所见，名曰白癞也。
陈实功曰∶癞风乃阳明湿热沸腾于肌表，或受风寒侵袭而成。其患初起水泡作
痒成疮，破流脂水，痒至彻骨，久则成片，延及遍身，好浴热汤，形如风癞。上体者
汗解外毒，下体者疏泻内毒为主。（《正宗》）
陈远公曰∶人一身发癞，皮浓生疮，血出如疥，或痛或痒，或湿或干，似虫非虫，
人以为湿热留于皮肤，谁知乃气血不能周到滋润乎！世多以苦参煎汤或 、白芷
外治不能奏效，正成于气血虚也。夫气血足则经络无闭塞之虞，气血旺则毛窍无枯
干之患，且气足血旺，则热散湿消，何至瘀滞不通，结于皮肤之外哉！治法以补气
血为主，佐以消湿散热，虽十载沉 ，尚可奏功，矧目前近癞乎！用扫癞丹∶黄
三两，当归、金银花各二两，白术、茯苓、麦冬、白芍、熟地、元参各一两，山萸、川
芎各五钱，生甘草、荆芥、花粉各三钱，防风二钱，水煎服，皮色即润，二剂干燥解，
十剂痊愈。（《冰鉴》。此方大补气血，无异枯涸之田，
逢甘霖之滂沛，生机勃勃，水满平畴，而蝗蝻之类自消于无形矣。）
从蛇虱、乌癞、癣疹开始，一直到湿痰流注结束，都汇集在这一部中，以便于查阅和参考治疗。
王肯堂说：蛇虱（一种皮肤顽疾）遍布全身，形状像风疹、疥疮或丹毒，颜色发白，不痛只是痒，抓挠后会出现白色皮屑。单用柏叶一味煎水清洗。内服蜡矾丸、金银皂角丸。（《医学准绳六要》）
《医宗心法》说：白癞俗称蛇虱。生于皮肤表面，形态像疹子或疥疮，颜色发白且瘙痒，抓挠后起白皮，这是由于风邪客居于皮肤，血燥不能濡养肌肤所致。用猪油、苦杏仁各等份捣匀，用绢布包裹擦拭。
王肯堂说：癞疾都是因为感受恶风以及触犯禁忌危害而得。刚开始觉得皮毛变黑，或者感到阵阵苦痒如虫行，或者眼前看到的物体像垂下的丝线，言语不定，心中常常惊恐，皮肉之中有时像桃李核一样硬结，瘾疹也变黑，手足顽固麻木，针刺感觉不到疼痛，脚底顽固疼痛无法踏地，凡进食时，张嘴出气并伴有鸣响，说话也是这样。身体生疮，又痛又痒且时常像虫行，或者两肘像被绳子捆绑，这名叫乌癞。又有黑癞。这两种癞疾的证候大同小异，所以不再分别记录。（《医学准绳六要》）
又说：白癞的患者声音嘶哑，视物不明，四肢顽固疼痛，身体大热，心中烦闷懊恼，手足松弛无力，背部脊柱拘急僵硬，体内感觉像针刺；或者生出瘾疹，往往在皮肉之间呈现正白色，鼻部长有息肉，眼睛长出白珠遮挡瞳孔，视物不见，名叫白癞。
陈实功说：癞风是由于阳明经湿热沸腾于肌表，或者受到风寒侵袭而成。其病患初起时有水泡作痒成疮，破溃后流出脂水，痒感彻骨，久了则成片，蔓延至全身，喜欢洗热水澡，形态像风癞。病在上体的以汗解外毒为主，病在下体的以疏泻内毒为主。（《外科正宗》）
陈远公说：人全身发出癞疾，皮肤增厚生疮，出血像疥疮一样，或者痛或者痒，或者湿或者干，似虫非虫，人们以为是湿热留在皮肤，谁知道其实是气血不能周到滋润呢！世人多用苦参煎汤或者苍术、白芷外治不能奏效，正是因为气血虚弱啊。如果气血充足，经络就没有闭塞的担忧，气血旺盛，毛窍就没有枯干的隐患，况且气足血旺，那么热散湿消，怎么会瘀滞不通，结聚在皮肤之外呢！治疗方法以补益气血为主，辅以消除湿气散热，即使是十年的沉疴，还可以取得功效，何况是近期的癞疾呢！使用扫癞丹：黄芪三两，当归、金银花各二两，白术、茯苓、麦冬、白芍、熟地黄、玄参各一两，山茱萸、川芎各五钱，生甘草、荆芥、天花粉各三钱，防风二钱，水煎服，皮肤颜色随即润泽，两剂后干燥解除，十剂痊愈。（《石室秘录》。此方大补气血，就像干枯的田地，遇到充沛的甘霖，生机勃勃，水流满平野，而蝗虫幼崽之类自然消溶于无形了。）
From the onset of She Shi (Snake Lice, a type of stubborn skin disease), Wu Lai (Black Leprosy), Xuan Zhen (Lichen Eruptions), up to Shi Tan Liu Zhu (Damp-Phlegm Flowing and Accumulating), all are compiled in this section for easy reference and treatment consultation.
Wang Kentang stated: She Shi manifests all over the body with a appearance resembling Feng Zhen (Wind Rash), Jie Chuang (Scabies), or Dan Du (Erysipelas). The color is white, painless but itchy; scratching produces white scales. Wash externally with a decoction of single herb Bai Ye (Cupressi Cacumen, Cypress Tip). Internally administer La Fan Wan (Beeswax and Alum Pill) and Jin Yin Zao Jiao Wan (Honeysuckle and Gleditsia Sinensis Pill). (*Yixue Zhunsheng*)
*Yizong Xinfa* states: Bai Lai (White Leprosy) is commonly known as She Shi. It arises on the skin, resembling rashes or scabies, with white coloration and itching; scratching yields white scales. This is caused by Wind Evil lodging in the skin and Blood Dryness failing to nourish the tissues. Rub externally with an equal mixture of Zhu You (Porcine Fat) and Ku Xing Ren (Bitter Apricot Seed), wrapped in silk cloth.
Wang Kentang stated: Lai Ji (Leprosy diseases) are contracted from exposure to malignant Wind and violating taboos. Initially, one may feel the hair and skin turning black, or experience intermittent bitter itching like insects crawling, or see objects before the eyes as if hanging threads. Speech may be erratic, and the heart often feels fearful. Within the skin and flesh, nodules may appear like peach or plum stones; wind rashes may turn black; limbs become stiffly numb, insensitive to needle pricking; the soles of the feet suffer stiff pain preventing walking. During eating, breath exits the mouth with a sound, and speech exhibits similar characteristics. Sores arise on the body, causing pain and itching with sensations of insect crawling; elbows may feel bound by ropes. This is named Wu Lai (Black Leprosy). There is also Hei Lai (Black Leprosy). The syndromes of these two types of Lai are largely similar with minor differences, thus they are not recorded separately. (*Yixue Zhunsheng*)
He further stated: Patients with Bai Lai have hoarse voices, blurred vision, stiffly painful limbs, high fever, mental restlessness and vexation, flaccid limbs, stiffness and tension in the back and spine, and internal sensations like needle pricks. Rashes may arise, often appearing distinctly white within the skin and flesh. Nasal polyps may form, and white opacities may grow in the eyes blocking the pupils, resulting in blindness. This is called Bai Lai.
Chen Shigong stated: Lai Feng (Leprous Wind) results from Damp-Heat boiling in the Yangming channel and manifesting on the muscle surface, or from invasion by Wind-Cold. The lesion begins with blisters that itch and form sores; upon rupture, serous fluid leaks out, with itching penetrating to the bone. Over time, lesions merge into patches spreading over the whole body. Patients often prefer hot baths, and the condition resembles Feng Lai (Wind Leprosy). For cases affecting the upper body, treatment focuses on sweating to release external toxins; for cases affecting the lower body, treatment focuses on draining to purge internal toxins. (*Waike Zhengzong*)
Chen Yuan Gong stated: When a person develops Lai disease all over the body, the skin thickens and sores form, bleeding like scabies, with pain or itching, dampness or dryness, appearing insect-like but not insects. People assume it is Damp-Heat lingering in the skin, who would know it is actually due to Qi and Blood failing to circulate and moisten thoroughly! Many use Ku Shen Decoction or Cang Zhu (Atractylodis Rhizoma), Bai Zhi (Angelicae Dahuricae Radix) for external treatment without effect, precisely because of Qi and Blood deficiency. If Qi and Blood are sufficient, meridians will not face blockage; if Qi and Blood are vigorous, hair follicles will not suffer withering and dryness. Moreover, with abundant Qi and Blood, Heat dissipates and Dampness vanishes; how could stagnation occur and knot outside the skin? The treatment method prioritizes tonifying Qi and Blood, assisted by resolving Dampness and clearing Heat. Even chronic conditions lasting ten years can be cured, let alone recent Lai disease. Use Sao Lai Dan (Leprosy Sweeping Powder): Huang Qi (Astragali Radix) 3 liang, Dang Gui (Angelicae Sinensis Radix) and Jin Yin Hua (Lonicerae Japonicae Flos) each 2 liang, Bai Zhu (Atractylodis Macrocephalae Rhizoma), Fu Ling (Poria), Mai Dong (Ophiopogonis Radix), Bai Shao (Paeoniae Radix Alba), Shu Di Huang (Rehmanniae Radix Praeparata), and Yuan Shen (Scrophulariae Radix) each 1 liang, Shan Yu (Corni Fructus) and Chuan Xiong (Ligustici Chuanxiong Rhizoma) each 5 qian, Sheng Gan Cao (Glycyrrhizae Radix et Rhizoma), Jing Jie (Schizonepetae Spica), and Hua Fen (Trichosanthis Radix) each 3 qian, Fang Feng (Saposhnikoviae Radix) 2 qian. Decoct in water and drink. Skin color becomes moist immediately; after two doses, dryness resolves; after ten doses, recovery is achieved. (*Shishi Milu*. This formula greatly tonifies Qi and Blood, akin to a dried field encountering abundant sweet rain; vitality thrives, water fills the plains, and pests like locust nymphs naturally dissolve into nothingness.)