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In ordinary cases of external sores (external ulcers), the pathogens are predominantly dampness and heat. When biased towards heat, it manifests as burning pain and suppuration; when biased towards dampness, it manifests as itching and oozing fluid. Generally, the distinction between pain and itching, and the presence or absence of pus/fluid, corresponds to the differentiation between heat-toxin and damp-pathogen syndromes. Heat-toxin pathologies tend to occur in the upper half of the body, while damp-toxin pathologies tend to occur in the lower half, reflecting the nature that fire flares upward and dampness sinks downward. Furthermore, damp-sores often spread invasively on the surface of the skin and at the extremities of the limbs. The accumulation and stagnation of dampness originates from the deficiency of Spleen Earth (the term "Bei Jian" is borrowed from *Su Wen*, meaning "insufficient Earth transport," referring to the lowly state of Earth virtue). However, if the Spleen were not steamed by the combination of dampness and heat, it would not disperse widely; only when dampness and heat combine does it flow into the limbs and reach the skin and hair follicles externally. Therefore, treating dampness in sores must be assisted by heat-clearing agents. In cases where dampness combines with wind-heat, such as wandering wind ascending to the neck and shoulders, one must clear and transform damp-heat while assisting with wind-dispersing methods. In cases where dampness combines with blood-heat, such as the itching of scabies and tinea, one must clear heat and transform dampness, prioritizing blood-cooling methods. In cases where Spleen-Stomach damp-heat spreads to the muscle surface, causing frequent oozing in conditions like yellow-water sores, one should awaken the Stomach and invigorate the Spleen, using diuresis to unblock the pathways (commonly known as bullous impetigo). In cases where Liver-Kidney damp-heat flows down to the groin and thighs, causing persistent itching in conditions like yin sores (such as scrotal wind in the anterior genitalia, or sit-board sores on the buttocks), the area may rot over a span of several days. Unless large doses of heat-clearing and detoxifying herbs are used urgently to arrest the progression, the condition will likely worsen. This is like a prairie fire; rescue measures cannot be delayed or treated with casual leisure. Conversely, when dampness is heavy and heat is light, flowing into the joints, it becomes liuzhu (flowing abscess); when cold-dampness obstructs the meridians, it becomes bi-zhuo (bi syndrome with sticking pain); when congealing in the bones and sinews, it presents as gu-bone abscess (osteomyelitis), Huan-tiao abscess, crane-knee deformity, or Wei-zhong toxicity. The pulse must be choppy and stagnant, and the tongue coating white and greasy. It is appropriate to employ drying dampness and unblocking collaterals, warming the meridians and promoting Qi flow. At the initial stage, treatment must begin with warming and moving methods; once Qi and Blood circulate freely, efficacy is immediate. If left neglected for too long, dampness stagnates internally, gradually transforming into heat, leading to internal suppuration, making a perfect cure difficult to guarantee.