发是足少阴之经血所荣也。血气盛，则发长美；若血虚少，则发不长，须以药治之令长
足少阴之经血，外养于发。血气盛，发则光润；若虚，则血不能养发，故发无润泽也。
足少阴之经血，外养于发。血气盛，发则润黑；虚竭者，不能荣发，故令发变黄。
足少阳之经血，外荣于须。血气盛，须则美而长；若虚少不足，不能荣润于外，故令须
足太阳之经，其脉起于目内 ，上额交巅。血气盛，则眉美有毫，血少则眉恶。眉为风
邪所伤，则眉脱，皆是血气伤损，不能荣养，故须以药生之。
夫发之生，血气所润养也。火烧之处，疮痕致密，则气血下沉，不能荣宣腠理，故发不
足少阴之血气，其华在发。足太阳之血气盛，则眉美；足少阳之血气盛，则须美；足阳
明之血气盛，则发美；手阳明之血气盛，则髭美。诸经血气盛，则眉、髭、须、发美泽。若
虚少枯竭，则变黄、白、悴、秃。若风邪乘其经络，血气改变，则异毛恶发妄生也，则须以药敷，令不生也。
凡人皆有九虫在腹内，值血气虚则能侵食。而蛲虫发动，最能生疮，乃成疽、癣、
、疥之属，无所不为。言白秃者，皆由此虫所作，谓在头生疮有虫，白痂甚痒，其上发并
秃落不生，故谓之白秃。
Hair is nourished by the blood of the Foot-Shaoyin Kidney Meridian (Zu Shao Yin Shen Jing). When Blood and Qi are abundant, hair grows long and beautiful; if Blood is deficient and scanty, hair fails to grow long, requiring medicinal treatment to promote growth.
The blood of the Foot-Shaoyin Kidney Meridian externally nourishes the hair. When Blood and Qi are abundant, hair becomes lustrous and smooth; if deficient, Blood cannot nourish the hair, resulting in a lack of luster.
The blood of the Foot-Shaoyin Kidney Meridian externally nourishes the hair. When Blood and Qi are abundant, hair becomes moist and black; if exhausted, it fails to provide prosperity to the hair, causing it to turn yellow.
The blood of the Foot-Shaoyang Gallbladder Meridian (Zu Shao Yang Dan Jing) externally prospers the beard. When Blood and Qi are abundant, the beard becomes beautiful and long; if deficient and insufficient, it fails to provide external moisture and prosperity, leading to [impaired beard growth].
The Foot-Taiyang Bladder Meridian (Zu Tai Yang Pang Guang Jing) originates from the inner canthus of the eye, ascends to the forehead, and intersects at the vertex. When Blood and Qi are abundant, eyebrows become beautiful with fine hairs; when scarce, eyebrows appear coarse or poor. If eyebrows are injured by Wind Pathogen (Feng Xie), they fall out. All these cases result from damage to Blood and Qi, failing to nourish, thus requiring medication to stimulate regrowth.
The growth of hair depends on the moisturizing and nourishing action of Blood and Qi. In areas burned by fire, if scar tissue becomes dense, Blood and Qi sink downward and fail to circulate through the Couli (pores and interstices), so hair does not grow.
The splendor of the Blood and Qi of the Foot-Shaoyin Kidney Meridian manifests in the hair. Abundant Blood and Qi of the Foot-Taiyang Bladder Meridian result in beautiful eyebrows; abundant Blood and Qi of the Foot-Shaoyang Gallbladder Meridian result in a beautiful beard; abundant Blood and Qi of the Foot-Yangming Stomach Meridian (Zu Yang Ming Wei Jing) result in beautiful scalp hair; abundant Blood and Qi of the Hand-Yangming Large Intestine Meridian (Shou Yangming Da Chang Jing) result in beautiful mustaches. When Blood and Qi of all meridians are abundant, eyebrows, mustaches, beards, and scalp hair are beautiful and lustrous. If deficient, scanty, or exhausted, they turn yellow, white, wither, or fall out. If Wind Pathogen invades the meridians, altering Blood and Qi, abnormal and ugly hair may grow randomly, requiring topical application of medicine to prevent such growth.
All ordinary people harbor nine types of parasites within the abdomen. When Blood and Qi are deficient, these parasites can invade and consume bodily resources. The activation of Ascaris lumbricoides-like worms (Nuo Chong) most readily causes sores, leading to conditions such as carbuncles (Ju), tinea (Xuan), [missing character], and scabies (Jie), committing various evils. The condition known as White Baldness (Bai Tu) is caused by these worms, referring to sores on the head with worms present, very itchy white crusts, and the subsequent loss and non-regrowth of hair above them.
This condition arises from head sores where worms feed, causing hair loss without white crusts but with exudate, red skin, and itching, hence termed Red Baldness (Chi Tu).