Check the time of occurrence, nature and color of the rash to diagnose white rash. 1. It is common in patients with high fever who sweat suddenly to reduce fever or sweat a lot. 2. The rash mostly occurs on the trunk. 3. The rash is a pinhead-sized blister with thin and slightly shiny walls, clear and transparent herpes, and no redness around the blister. The wall of the blister is broken by light rubbing. After healing, there are very thin, fine scales. Therefore, the clinical examination for patients with white prickly heat should be: 1, physical examination Taking a medical history gives us an initial impression and insight, and also guides us to have a concept of the nature of the disease. 2, laboratory tests Laboratory tests must be based on the history and physical examination of the objective materials learned to summarize and analyze, from which several diagnostic possibilities are proposed, and then further consider those laboratory tests to confirm the diagnosis.