Discover 35 essential facts about Koplik 's spots , their role in diagnosing measles, symptoms, and treatment options. Stay informed and protect your health. Koplik 's spots are white lesions on the mouth that appear before the rash of measles. They are named after Henry Koplik , who described them in 1896, and are useful for diagnosis and control of the disease. Enanthems are oral and mucosal rashes or spots that appear in many viral infections, particularly in children. They can be diagnostic of these diseases.