Thrush is an acute pseudomembranous damage to the oral mucosa caused by Candida albicans infection, and is a common oral inflammatory disease in infants and children, especially in newborns and infants <6 months of age. The mucosa of the lesion area is congested and edematous, with scattered soft white spots, like curds, which are semi-adhesive and slightly elevated; they soon fuse with each other and expand into white or blue-white fluffy patches, and can continue to expand and spread, and in severe cases can spread to the tonsils and pharynx. After a few days, the mucous membrane congestion of the lesion decreases, and the color of the white patches turns to light yellow, or yellow-brown with time. The patches are semi-adherent to the mucosa and can only be removed with a little force, and the red mucosal erosion surface is exposed after forcible tearing off, even with mild bleeding. Refusal to eat and crying are more common, but the systemic reaction of the child is not obvious, and some children may have a slightly elevated body temperature. If treatment is not timely, the lesion may spread to the back of the mouth to the esophagus and trachea, causing esophageal candidiasis and pulmonary Candida infection, and swallowing or breathing difficulties. In a few cases, the germs can enter the blood circulation and form Candida albicans sepsis, which is critical and can occasionally cause serious diseases such as endocarditis and meningitis.