Black crusts on the palate are commonly associated with pulmonary trichinosis. Pulmonary trichomycosis is a pulmonary infectious disease caused by pathogenic bacteria of the order Trichophyton. Although rare, it develops rapidly and has a high mortality rate, and is clinically more common with Trichoderma and Rhizopus. So what are the screening items for black scorch on the palate? Here is a brief introduction. Palate with black scab examination items 1, pulmonary Trichoderma histopathology is not specific, mainly based on tissue sections found within the coarse mycelium without separation or sparse separation, no or little cellular reaction. Its characteristic changes mycelium is very easy to invade the wall of large and small arteries leading to infarction, causing necrosis of adjacent tissues. 2, laboratory examination (1) direct microscopy: specimens from the upper turbinate scrapings, sinus aspirates, sputum and biopsy specimens, etc., with 20% potassium hydroxide made of wet film direct microscopy, can be seen in the typical thick-walled refractive mycelium, 6-15μm in diameter, can also see the expanded cells and curved mycelium. Spore peduncle directly from the mycelium growth, mycelium can branch, at right angles. (2) culture: clinical specimens inoculated in the maltose medium without actinomycin, potato medium and ordinary sand medium, 37 ℃ or 25 ℃ culture, faster growth, the initial surface of the colony is cotton-like, white, gradually change to gray-brown or other colors. Pulmonary trichinosis is dangerous, and trichinosis often contaminate the sputum and environment, so direct microscopic examination is often more meaningful than culture. 3, other auxiliary tests: X-ray chest film shows non-specific pneumonia and pulmonary infarction.