RT Book, Section A1 Garra, Gregory A2 Tenenbein, Milton A2 Macias, Charles G. A2 Sharieff, Ghazala Q. A2 Yamamoto, Loren G. A2 Schafermeyer, Robert SR Print(0) ID 1155167627 T1 Approach to the Patient with Rash T2 Strange and Schafermeyer's Pediatric Emergency Medicine, 5e YR 2019 FD 2019 PB McGraw-Hill Education PP New York, NY SN 9781259860751 LK accessemergencymedicine.mhmedical.com/content.aspx?aid=1155167627 RD 2024/04/25 AB Primary lesions are uncomplicated abnormalities that represent the initial pathologic change. Secondary changes reflect progression of disease.Diagnosis depends upon identification of the primary lesion. Other features, such as distribution, configuration, and color assist in narrowing the diagnosis. These features along with a focused history and knowledge of key clinical features usually result in a specific diagnosis of dermatologic conditions.The clinician must recognize, and communicate to the patient, that there are times when it is difficult to narrow the final diagnosis to a single entity.