A painless ulcer under the tongue that has not healed for two weeks, with associated leukoplakia, is most indicative of which condition?

• A. Oral candidiasis
• B. Aphthous ulcer
• C. Leukoplakia
• D. Squamous cell carcinoma

Answer: (D)

A persistent, painless ulcer under the tongue that has not healed in two weeks is a red flag for cancer. When an ulcer stays around and is accompanied by a leukoplakic patch (a white, keratinized area that cannot be rubbed off), it raises concern for malignant change, most often squamous cell carcinoma. The tongue is a common site for this cancer, and painless, indurated or non-healing ulcers are typical early signs, especially in people with risk factors like tobacco or alcohol use.

Oral candidiasis usually presents as white plaques that can be wiped away and is often associated with a burning sensation or soreness rather than a solitary, non-healing ulcer. Aphthous ulcers are typically painful and self-limiting within about a week or two, and leukoplakia is just a white patch without a persistent ulcer. The combination of a non-healing ulcer plus leukoplakia most strongly points to squamous cell carcinoma and should prompt urgent referral for biopsy.