There is no difference between heat rash and prickly heat. Prickly heat, also known as “sweat rash”, is commonly known as “heat rash”. Prickly heat is mainly seen in summer when the weather is hot. Prickly heat is due to the environment of high temperature, high humidity, sweating too much, not easy to evaporate, sweat penetration and stimulation of the surrounding tissues and appear in the sweat holes pimples, papules and small blisters. Prickly heat is an inflammatory skin disease that occurs in summer or hot conditions. The surrounding environment should be controlled at a suitable temperature to avoid stifling heat, keep the skin fresh and clean, bathe regularly, and wear loose cotton clothing. Also keep away from irritating environment. If prickly heat is not serious, it can usually be relieved. In our daily life, we have to wash our skin frequently to keep it clean and dry. When the weather is hot, we have to wear loose and breathable clothes to make it easier for the skin to dissipate heat. If prickly heat cannot be relieved after care, we should consult a doctor according to the specific situation, and should not use drugs indiscriminately.