Plaque psoriasis is characterized by plaque-shaped skin lesions， thickened scaling， and a prolonged disease course. In traditional Chinese medicine （TCM）， it is referred to as

Bai Bi

， with blood stasis being the most common syndrome. The core pathogenesis is characterized by

yin-yang

imbalance and stasis heat in the blood aspect. Based on the theory that "

yang

transforming

qi

while

yin

constituting form"， Professor SUN Liyun of the

Yanjing

ZHAO's

Dermatology School proposed the therapeutic principle of "dynamic regulation and balancing of

yin

and

yang

"， adopting strategies of clearing heat， activating blood， and regulating

yin

and

yang

. Accordingly， she formulated

Qinteng Huoxue Formula

， composed of

Gentianae Macrophyllae Radix

，

Sophorae Flavescentis Radix， Hedyotis Diffusae Herba， Spatholobi Caulis， Lonicerae Japonicae Caulis

， and

Uncariae Ramulus cum Uncis

. For heat clearing，

Gentianae Macrophyllae Radix

disperses exterior heat，

Hedyotis Diffusae Herba

clears blood toxins， and

Sophorae Flavescentis Radix

drains interior heat， thereby blocking the transmission and transformation of pathogenic heat. For activating blood circulation，

Spatholobi Caulis

warms and unblocks the channels to promote the generation of new blood， while

Lonicerae Japonicae Caulis

cools and disperses stasis heat； the combined use of warm and cold drugs facilitates the unblocking of the collaterals. For regulation and balance，

Uncariae Ramulus cum Uncis

pacifies the liver， subdues

yang

， and harmonizes

yin

and

yang

. In cases of yang deficiency with cold congealment， Sophorae Flavescentis Radix may be omitted to prevent damage to

yang qi

， and

Cinnamomi Ramulus

and

Aconiti Lateralis Radix Praeparata

may be added as appropriate to warm

yang

and unblock the vessels， together with

Persicae Semen

and

Carthami Flos

to break stasis and moisten dryness. This forms a harmonizing approach characterized by "warming

yang

and dispersing cold， clearing and venting latent heat， and activating blood to resolve stasis"， embodying the principles of "seeking

yin

within

yang

" and "eliminating pathogenic factors without injuring healthy

qi

"