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In medicine, observation (Wang) and listening/smelling (Wen) are prioritized, followed by inquiry (Wen) and palpation/pulse diagnosis (Qie); this is well known to all. However, regarding Sha syndrome (a condition characterized by toxic heat or stasis manifesting as skin changes), observation and listening may not be fully illuminating, and inquiry and palpation may not exhaustively reveal the pathology; can a physician simply cease treatment? I observe that in the world there are cases of "hidden Sha" (An Sha) that go unrecognized, often leading to misdiagnosis. Therefore, why not use the examination of "Sha Jin" (visible subcutaneous veins indicating Sha toxin) to verify it? When the needle tip pierces the flesh slightly, only those with Sha toxin will have dark purple-black blood flow out; for those without Sha toxin, even if pierced by the needle tip, not a single drop of blood appears. Thus, Sha syndrome can be distinguished by Sha Jin, just as other diseases are distinguished by their specific symptoms. The color presented by Sha Jin is cyanotic-purple; its origin lies in the presence of toxins within the blood, does it not? Since these toxins in the blood cannot be eliminated solely by medication, one should naturally know to employ bloodletting. If bloodletting does not completely expel the toxin, then scraping (Gua Sha) or herbal medicine is appropriate. One must assess the cold-cool nature of the pathogen to weigh the severity of treatment, utilizing the properties of herbs to rescue from critical danger. All this serves to drive out the retained Sha toxin and save the patient's life. Why do some people disbelieve in Sha syndrome, suffering the real calamity of Sha manifestations, and resign themselves to death?

If Sha attacks rapidly, death may occur within moments; if it is slow, death may come in ten days or half a month, or even in one or two months, and sometimes up to three or four months; this is indeed what is called "Slow Sha." Yet I insist on immediate treatment; is this excessive worry? No, it is not. Although the course leading to death from Sha may seem prolonged, the Sha toxin spreading through the intestines, stomach, meridians, and collaterals harbors many perilous situations. For instance, if Sha toxin stagnates and knots in the body—whether on the left or right, upper or lower, interior or exterior—it will not remain stagnant in that state alone. It will proceed to damage the internal Zang-Fu organs first, injure the meridians and collaterals in the middle, and ulcerate the muscles on the surface first. Although death does not occur immediately, the signs of incurability will inevitably appear beforehand. If left untreated, it becomes a fatal case. Such is the terror of Slow Sha. How can one refrain from early and rapid treatment merely because the date of death seems distant?