Pus moss is a secretion produced by white blood cells after phagocytosis of viral bacteria attached to the surface of ulcers or tissues as necrotic tissue. Abscess moss not only affects the patient’s appearance, but can have very serious consequences if left untreated. The disease causing pustular moss may have the characteristics of contact transmission and autoinoculation infection, and is easily prevalent among children. The pathogenic bacteria are mainly Staphylococcus aureus or Streptococcus b haemolyticus with positive coagulation plum alone or mixed infections. In summer and autumn, high temperature, high humidity, skin impregnation, etc., are easy to make the bacteria invade the skin to reproduce, creating favorable conditions for the development of pustular moss. Diagnosis basis: 1. It occurs mostly in summer and autumn, and is more common in children. 2. The lesions of common impetigo are red spots of corn to soybean size, with blisters on the surface, which rapidly transform into pustules, with thin walls and a red halo around them, forming a vesicular surface after rupture, covered with honey-yellow scabs. It can spread around due to self-propagation, and can also fuse into patches, and is most common on the face, especially around the mouth, near the nostrils, earwalls and extremities. 3.Pustular impetigo lesions are scattered large blisters with inconspicuous surrounding redness, forming a large vesicle after rupture and crusting in the form of varnish after drying, which cannot be easily peeled off. 4.Self-perceived itching. In severe cases, it may be accompanied by enlargement of nearby lymph nodes, and there may be fever, chills and other systemic symptoms. 5.Laboratory tests show that the total number of white blood cells and neutrophils may be increased. Bacterial culture of pus is Staphylococcus aureus or Streptococcus haemolyticus.