Thrush on physical exam is described as creamy white, slightly elevated plaques on the oral mucosa that can be scraped off with a tongue blade, revealing an erythematous or bleeding base underneath. That scraping maneuver is the single most important clinical feature distinguishing thrush from other white oral lesions. But thrush has several presentations beyond the classic white patches, and documenting it well means noting the morphology, distribution, and associated findings.
The Classic Pseudomembranous Form
The most recognizable presentation is pseudomembranous candidiasis: soft, slightly elevated, white to creamy white plaques on the tongue, buccal mucosa, or both. These plaques have a curd-like texture and are composed of fungal elements, shed epithelial cells, and debris. They sit on top of the mucosa rather than being incorporated into it, which is why they wipe away.
In your documentation, describe the color (white, creamy white, or occasionally yellowish), the texture (soft, curd-like, plaque-like), the distribution (which mucosal surfaces are involved), and the result of scraping. A well-written exam note might read: “Creamy white, curd-like plaques on the buccal mucosa bilaterally and dorsal tongue. Plaques are easily removed with a tongue blade, revealing erythematous, friable mucosa beneath.”
The plaques most commonly appear on the tongue and inner cheeks. They can also spread to the hard or soft palate, gums, tonsils, and the posterior oropharynx. Noting exactly which surfaces are involved helps communicate the extent of disease.
The Scraping Test
Scraping the plaque with a tongue depressor is the key bedside maneuver. If the white patch lifts off and leaves behind a red, raw, or bleeding surface, that strongly supports a diagnosis of thrush. This distinguishes it from other white lesions that are fixed to the tissue.
In documentation, you can describe this as: “White plaques are removable with gentle scraping, revealing erythematous erosions at the base.” If bleeding occurs, note that the base is friable. This finding alone is often sufficient to make a clinical diagnosis without laboratory testing.
Erythematous Candidiasis
Not all oral candidiasis looks white. The erythematous form presents as flat, red patches rather than raised white plaques. On the dorsal tongue, these appear as smooth, depapillated areas where the normal tongue texture is lost. On the palate or buccal mucosa, they appear as diffuse redness without an obvious plaque.
This form is easy to miss because clinicians often expect thrush to be white. On exam, describe it as: “Erythematous, depapillated patches on the dorsal tongue” or “diffuse erythema of the hard palate without discrete plaques.” Erythematous candidiasis is particularly common in people with HIV.
Chronic Hyperplastic Candidiasis
This subtype breaks the scraping rule. Chronic hyperplastic candidiasis presents as white plaques, typically at the corners of the mouth or lateral tongue, that cannot be wiped off. The lesions are adherent to the underlying tissue, making them clinically difficult to distinguish from leukoplakia or oral hairy leukoplakia on exam alone.
When you encounter a white oral lesion that does not scrape off, document that finding explicitly: “Adherent white plaque on the left lateral tongue, approximately 5 mm, not removable with scraping.” This signals that the differential is broader and may include premalignant conditions that warrant biopsy.
Angular Cheilitis as an Associated Finding
Thrush frequently appears alongside angular cheilitis, especially in infants and immunocompromised patients. Angular cheilitis presents as red, fissured, or macerated patches at the corners of the mouth, typically triangular in shape. Mild cases show pinkish redness. More advanced cases develop superficial erosions with gray-white areas bordered by redness, and severe cases can crack open and bleed.
When you see thrush and corner-of-mouth involvement together, document both: “Pseudomembranous plaques on buccal mucosa with concurrent erythematous, fissured lesions at bilateral labial commissures consistent with angular cheilitis.” In infants, angular cheilitis almost always accompanies oral thrush and treating one without the other leads to recurrence.
Distinguishing Thrush From Lookalikes
Several other conditions produce white patches in the mouth, and your exam note should reflect that you considered them. The key differentiators are scrapability, pattern, and location.
- Leukoplakia: White patches that do not scrape off. Tobacco-related leukoplakia can appear anywhere in the oral cavity and lacks the shaggy texture seen in some other white lesions. It requires biopsy to rule out dysplasia.
- Oral lichen planus: Presents with a lacy, reticulated (net-like) white pattern, most often on the buccal mucosa. It is an autoimmune or allergic process and may have associated skin lesions.
- Milk residue in infants: Thin, white coating on the tongue that is easily distinguished from thrush because it appears as a smooth film rather than thick, raised patches. Community nurses in neonatal clinics differentiate thrush from milk by noting that thrush patches appear thick and yellowish, while milk residue is thinner and uniform.
If you are uncertain, documenting the scraping result clarifies your reasoning. “White patches on buccal mucosa, removable with scraping revealing erythematous base, consistent with pseudomembranous candidiasis rather than leukoplakia” communicates both the finding and your clinical logic.
Putting It All Together in a Note
A thorough exam note for oral thrush covers four elements: morphology, location, extent, and the scraping result. Here is an example of a complete description:
“Oral cavity exam reveals multiple creamy white, curd-like plaques on the buccal mucosa bilaterally, dorsal tongue, and soft palate. Plaques are easily removed with a tongue blade, leaving behind erythematous, friable mucosa. No extension to the oropharynx or tonsillar pillars. Bilateral labial commissures show erythema with superficial fissuring. No ulcerations or vesicles noted.”
Including what you did not see (no ulcers, no oropharyngeal extension) is just as valuable as describing what you found, because it helps define the boundaries of the disease and narrows the differential. Noting whether the oropharynx is involved also matters for treatment decisions, since oropharyngeal extension suggests more significant disease burden.