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. Pus moss not only affects the patient’s appearance, but also can cause very serious consequences if left untreated. The examination items of pustular moss focus on the distribution site of pustular moss, the type, number, size, shape, surface and base of pustular moss, color, blister contents and other aspects. Examination items: 1. Intradermal test: The operator will expose the left upper limb or right upper limb of the patient, also can use the back after disinfection and disposal of the skin, will be prepared, in order of the specific antigen for intradermal injection. After 15 minutes to observe the skin reaction of the test area, a positive reaction for the pus moss, depending on the size of the reaction, to determine the reaction level, 2, puncture test: or “puncture” or “prick” test, is to use a special puncture needle or ordinary puncture needle, the prior drop in the The antigen at the forearm will be pricked without causing bleeding and then observed for 15 minutes. Prick test method is simple, convenient, safe and fast, easy to accept, and in recent years the number of people doing this test is gradually increasing. 3, patch test: patch test is to test the antigen material in direct contact with the skin, under the cover of the patch test chamber, closed for several hours, in order to carry out the patch test in the upper and lower order.