Most likely diagnosis for the red palatal mucosa with pinpoint lesions under the denture:

Correct answer: B. Denture stomatitis

• A. A traumatic ulcer is a discrete sore, not diffuse denture-area erythema.
• B. Correct. Chronic denture wear with diffuse erythema/pinpoint papillary lesions confined to the denture-bearing palate is denture stomatitis (often Candida-related, Newton's classification).
• C. Lichen planus shows reticular/striated patterns, not this denture-outline erythema.
• D. The condition is specifically related to the denture, so "without denture involvement" is incorrect.