Ulcer is a category of diseases caused by the obstruction of meridians by pathogenic toxins， leading to the putrefaction of flesh. However， the foot regions are traversed by numerous meridians， with distinct differences in

qi

， blood，

yin

， and

yang

properties among the three

yin

and three

yang

meridians， resulting in complex historical nomenclature and clinical manifestations. The pathogenesis fundamentally arises from the accumulation of visceral toxins within the meridians， compounded by the invasion of external six pathogens into the collateral branches. During the stage of suppurative toxin accumulation， internal medications may prove insufficient for acute management. Interventions such as acupuncture， stone needles， and moxibustion should be prioritized to debride and drain the affected area， thereby alleviating meridian obstruction and creating an outlet for purulent toxins.After sepsis has been completely eliminated， the differentiation of syndromes should be based on meridians， and acupoints should be selected according to these meridians. Three

yang

meridian lesions carbuncle is often caused by damp heat， cold coagulation， or phlegm-fire stagnation. Treatment should focus on methods such as clearing heat， warming and dispersing， or promoting diuresis. Three

yin

meridian lesions predominantly stem from spleen deficiency with damp retention， liver-kidney depletion， or blood vacuity， requiring strategies to fortify the

spleen and dispel dampness， nourish

yin

and warm

yang

， or course the liver and nourish blood. Thus， the treatment of carbuncles must prioritize meridian differentiation， discerning the interplay of

qi

-blood repletion-vacuity and visceral pathophysiology to achieve holistic intervention addressing both symptoms and root causes， thereby promoting wound healing.