Wipe the affected skin with a hot towel or ginger, dry it and stick a plaster on it. Generally, a plaster should not exceed 24 hours at the longest. After a long time, the plaster is not only ineffective, but also bad for the skin. Stick plaster to avoid places where there are many hairs, otherwise it will not stick, and second, it will bring up hair and cause pain when it is torn off. Should not be attached to the head and face, especially near the eyes, nose and mouth. It's cold in winter, so the adhesive plaster doesn't stick easily. After sticking, you can apply the plaster with a hot water bottle, so that it can be stuck firmly and ensure the therapeutic effect. In addition, when using the black plaster, you should first stick the plaster on the outside of the hot water kettle (cup) or on the low fire of alcohol lamp or candle, and then apply it to the affected area when the plaster does not burn the skin, which can last for 1 ~ 2 weeks. Some people use this plaster and bake it directly on the coal stove. This method is not advisable. When the coal stove burns, it will produce carcinogens and harmful gases such as carbon monoxide, carbon dioxide, sulfur dioxide, etc., which will be absorbed by gypsum matrix and water, and penetrate into human body through the skin, which will bring certain harm to people.

Pay attention to taboos. When muscle contusion or joint ligament strain occurs, do not immediately apply Shangshi Zhitong Ointment and Musk Zhuifeng Ointment to the affected area. This plaster has the function of promoting blood circulation and removing blood stasis, but it can't achieve the purpose of relieving swelling and pain immediately after injury, and it will be applied again after a period of time. If there is local injury, it is not advisable to stick the plaster directly on the injured part to avoid suppurative infection. All plasters containing musk, frankincense, myrrh, peach kernel and other ingredients for promoting blood circulation and removing blood stasis are prohibited for pregnant women. If papules and blisters appear on the local skin about 10 minutes after sticking the plaster, it means that you are allergic to this plaster. You should immediately stop sticking the plaster, take oral antiallergic drugs and apply topical hormone ointment for antiallergic treatment.

I hope my answer can help you, and I wish you all the best in the Year of the Horse.