Children with prickly heat can not use patchouli water external washing. Prickly heat is a relatively common skin disease in childhood, mostly occurring in the hot summer, children’s forehead, neck, jaw are prickly heat is a good part. In the hot and stuffy environment, a large amount of sweat is not easy to evaporate, so that the stratum corneum is impregnated and swollen, resulting in narrowing or blocking of sweat ducts, stagnation of sweat in the sweat ducts, increased pressure, rupture of the sweat ducts, and extravasation of sweat into the surrounding tissues and cause disease. Bacterial proliferation on the skin surface produces toxins, which also aggravate the inflammatory response. Topical medication is based on the principle of cooling, astringency and itching relief, and can be used externally with glycerite lotion and prickly heat powder, and 2% ichthyol glycerite lotion can be used externally for pustular heat rash. Oral antihistamine can be taken for obvious itching, and oral antibiotics can be taken for serious infection of pus rash. Patchouli Zhengqi Shui belongs to a kind of proprietary Chinese medicine, the main ingredients of which are Cangzhu, Chen Pi and other proprietary Chinese medicines, has the effect of relieving the epidermis and dampness as well as regulating qi and neutralizing, and is often used to treat colds and flu caused by external wind-cold or summer summer dampness in the clinic. The correct way to use Huo Xiang Zheng Qi Shui is to take it orally, not as a topical application. The alcohol contained in patchouli Zhengqi Shui may cause some skin irritation when used topically, and may aggravate the symptoms when the child’s prickly heat area becomes seriously infected or itchy, which is not conducive to recovery. When treating children’s prickly heat, it is important to follow the doctor’s instructions strictly and not to use the medication arbitrarily.