Each of the following is a common manifestation of an allergic response to a dental material EXCEPT one. Which is the EXCEPTION?

Correct answer: B. Erythema multiforme

• A. INCORRECT — Tingling and itching of the oral mucosa is a typical early sign of contact allergic stomatitis from dental materials (e.g., acrylics, metals).
• B. CORRECT (EXCEPTION) — Erythema multiforme is NOT a common allergic response to dental materials. It is an acute immune-mediated mucocutaneous condition most often triggered by HSV infection or drugs (e.g., sulfonamides), not by contact with dental materials.
• C. INCORRECT — Oral lichenoid lesions (lichenoid contact reactions) are well-documented allergic responses to amalgam or other dental materials, especially in adjacent mucosa.
• D. INCORRECT — Cheilitis (lip inflammation) can occur as an allergic reaction to dental materials, particularly acrylics, rubber, or topical agents.