Plasters, commonly known as dog-skin plasters, are traditional external preparations originating from the Ming and Qing dynasties. They are made from medicinal herbs, edible vegetable oils, and red lead, spread onto a backing material. Through skin penetration, they are used to treat boils, swelling, pain, and rheumatic bone diseases, possessing anti-inflammatory, analgesic, blood-activating, and wind-dispelling properties. When using them, the plaster should be applied according to the affected area, combined with heat application or moderate heating to enhance adhesion. Attention should be paid to allergic reactions and proper cleaning methods.
The theoretical basis of plasters originates from the traditional Chinese medicine concept of "treating winter diseases in summer," emphasizing the dispelling of cold and dampness during the summer when Yang energy is abundant. The Zhang school of plasters combines this with the principle of "nourishing Yang in spring and summer," utilizing the dilated pores of the body in summer to allow the medicine to more easily reach the affected area through the meridians, enhancing efficacy. During use, traditional application methods must be followed, taking into account seasonal characteristics and skin absorption patterns, thus continuing the use of plasters as an important practical form of external treatment in traditional Chinese medicine.
