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The *Ling Shu · Han Re Bing Pian* states: In **Pi Han Re** (Skin Cold-Heat Disorder), the patient cannot lie close to the mat, hair becomes scorched and dry, the nose becomes atrophic and dry, and there is no sweating. Treatment involves selecting the collaterals of the Three Yang meridians and supplementing the Hand Taiyin Lung Meridian.

Collaterals are superficially located in the skin. Pi Han Re is caused by pathogenic factors closing off the skin and causing pain, hence the inability to lie close to the mat; the skin and hair are associated with the Lung, and the Lung opens into the nose. Due to external closure of pathogens, Yang Qi stagnates and transforms into heat, resulting in scorched hair and a dry, atrophic nose ("La" refers to scorched dryness). At this stage, Lung fluids are already damaged, and if prolonged, it will inevitably develop into Fei Wei (Lung萎/Flaccidity Syndrome). Therefore, one should urgently select the collaterals of the Three Yang meridians to drain pathogenic factors from the skin, and supplement the Hand Taiyin Meridian to rescue the Lung.

In the *Ling Shu · Kou Wen Pian*, Qibo stated: When cold qi lodges in the skin, Yin Qi becomes excessive and Yang Qi deficient, leading to Zhen Han (Shivering Chills). Treatment involves supplementing the various Yang meridians. This is because Yin excess and Yang deficiency prevent the body from overcoming external cold, resulting only in cold sensations without internal heat symptoms. Thus, one should supplement the various Yang meridians to disperse external cold, which differs from the aforementioned Pi Han Re disorder in terms of Yin-Yang and Deficiency-Excess patterns.

In Ji Han Re (Muscle Cold-Heat Disorder), there is muscle pain, scorched hair, dry and atrophic lips, and no sweating. Treatment involves selecting points on the lower part of the Three Yang meridians to remove blood stasis, and supplementing the Foot Taiyin Spleen Meridian to induce sweating.

Ji Han Re occurs when pathogens deepen from the skin and hair into the muscles. The lips are the root of the muscles and are governed by the Spleen; since pathogens have invaded the Spleen, hair becomes scorched, muscles hurt, and lips become dry and atrophic. Selecting points on the lower part of the Three Yang meridians for bloodletting serves to unblock Ying and Wei Qi to resolve pathogens in the muscles, as Ying and Wei Qi circulate within the muscles. Once Ying and Wei are unblocked, supplementing the Foot Taiyin Spleen Meridian nourishes Jin Ye (Body Fluids) and assists in sweating, thereby resolving the disease.

In Gu Han Re (Bone Cold-Heat Disorder), the patient feels unsettled and unable to find comfort, with continuous profuse sweating. If the teeth have not yet become dry, one should select the collateral of the Foot Shaoyin Kidney Meridian in the inner thigh; if the teeth are already dry, it is a fatal condition that cannot be treated. Gu Jue (Bone Jue) presents similarly.

Gu Han Re occurs when pathogens deepen from the muscles into the bones. Since the pathogens have penetrated deeply, the exterior layers are further damaged, resulting in severe illness with no moments of rest and continuous profuse sweating, indicating depletion of Jin Qi (Fluids and Qi). Teeth are the surplus of bones, and bones are governed by the Kidney. If the teeth are not dry, it indicates that Kidney Water has not been exhausted; thus, one selects the collateral of the Foot Shaoyin Kidney Meridian in the inner thigh to drain pathogenic heat. If the teeth are dry, it indicates exhaustion of Kidney Water, constituting a fatal condition. Gu Jue refers to burning heat in the bones accompanied by cold extremities, commonly known in modern times as Gu Zheng Lao Bing (Bone-steaming Consumption Disease/Tuberculosis). One should also examine the teeth to distinguish between life and death prognoses.