Prickly heat and heat rash are different. Prickly heat is a dermatological condition, commonly known as prickly heat, caused by high temperatures and hot weather when the body's sweating mechanism fails, resulting in the development of prickly heat on the skin. On the other hand, heat rash is a symptom that can appear in many diseases. Of course, prickly heat can also manifest symptoms of heat rash. Therefore, the difference between prickly heat and heat rash is quite significant.