A patient who had a biopsy on tooth #13 wakes the next morning with a painless swelling of the upper lip that is the same color as the surrounding mucosa. What is the MOST likely diagnosis?

Correct answer: B. Angioedema

• A. Incorrect. A hematoma appears DARKER (purple/bluish) and is tender to palpation.
• B. Correct. ANGIOEDEMA is a deep dermal/submucosal swelling appearing as PAINLESS, NON-ERYTHEMATOUS swelling (same color as surrounding tissue). It typically involves the lips and face. Post-dental procedure angioedema may represent a delayed allergic reaction to anesthetic, latex, or other materials used.
• C. Incorrect. An abscess develops over days, presenting with swelling, pain, warmth, and fluctuance — not an overnight painless normal-colored swelling.
• D. Incorrect. Cellulitis presents with warmth, REDNESS, tenderness, and fever — not a painless, normal-colored swelling.