The obvious stinging sensation of plastering may be directly related to the irritating nature of the drugs contained in the plaster. Most of the ointments choose large warm, hot drugs, in the process of external application, may burn the skin, especially the more sensitive skin, or belong to allergic people, in the process of plastering, because of the irritation of the drug will cause skin reactions. Light patients may show itching, tingling, serious may show local skin redness, swelling, heat, pain, and even cause local skin burns. For this condition, it is important to note that if you have sensitive skin, try not to choose creams that are irritating. It may also be directly related to the reaction of the drug in the process of applying the cream, most of these drugs have the effect of pungent warmth and blood circulation, when applied to the affected area, the drug acts locally to give the patient a subjective feeling.