The human face is not only a stage for the performance of the seven emotions, but also a window to reflect the diseases in the body. Therefore, the examination of the face is an important and easy way to detect diseases at an early stage. Scarlet fever face: The face is congested and flushed, and the skin around the mouth and nose is obviously pale. This symptom is a symptom of scarlet fever, an acute rash respiratory infection caused by a group A type B hemolytic streptococcus, which is known in Chinese medicine as “rotten throat cholera” and occurs mainly in the winter and spring. Any age can be affected, but babies between the ages of 2 and 8 are most likely to be infected. What are the tests for scarlet fever facial expressions? 1, facial expression: facial expression is a normal person with a natural expression and a peaceful demeanor, when certain diseases are troubled, or when the disease has progressed to a certain level certain characteristic facial expressions can appear, sickly face facial congestion flushed, the skin tone around the mouth and nose is obviously pale. The face of a healthy person should have two eyes, clear eyebrows and lustrous skin. 2, ASO test: ASO test is anti-streptococcal hemolysin O test, streptococcal hemolysin is one of the metabolites of hemolytic streptococci. After the human body is infected with this type of streptococcus, a large number of anti-streptococcal hemolysin 0 (ASO) antibodies can appear in the serum.