Tongue white like frost may be coccidioidomycosis, white spots, oral candidiasis, specific need to go to the hospital for oral and laboratory examination. 1. Coccidioidomycosis: oral staphylococcus aureus, streptococcus and other bacterial infections can appear on the back of the tongue grayish-white pseudomembrane, protruding mucosal surface, dense and smooth, pseudomembrane torn off the visible surface of the vesicles. 2. White spot: long-term betel nut chewing or smoking and other oral stimuli can cause oral white spot, can appear in any part of the oral mucosa, can not be wiped off, self-conscious roughness and astringency, with cancerous tendency. 3. Oral candidiasis: oral candida infection can appear in the oral cavity colored white as snow false membrane, can be removed, laboratory examination can see candida mycelium and spores. The tongue is normally light pink, when there is an abnormal color and texture, it is recommended to go to the hospital for examination and treatment.