Pathology · patient case question
A different patient with PEMPHIGUS VULGARIS and extensive oral erosions asks about high-dose vitamin supplements. Which is most likely to complicate her oral condition?
Patient case: Desquamative gingivitis with generalized erythema and focal ulceration
Patient: Female, 61 years old
Chief Complaint: “My gums are raw and they peel when I brush.”
Background: No relevant medical history recorded at presentation. No new medications. Reports intermittent grittiness and redness of both eyes over the past year, attributed to dryness.
Vital Signs: BP 130/80 mmHg · HR 74 bpm · T 98.2°F
Findings: Generalized erythema of the attached and marginal gingiva with focal areas of ulceration and sloughing. Gentle lateral pressure produces separation of the epithelium. Direct immunofluorescence shows a linear band of IgG and C3 along the basement membrane zone.
Show answer and explanation
Correct answer: A. Vitamin E (tocopherol)
- A. CORRECT as keyed. Vitamin E is FAT-SOLUBLE and therefore accumulates. In high doses it antagonises vitamin-K-dependent clotting and inhibits platelet aggregation, producing a bleeding tendency — which matters directly in a mouth already covered with denuded, friable erosions, and which compounds the corticosteroid and azathioprine therapy these patients are usually taking. Fat-soluble vitamins A, D, E and K are the ones capable of toxicity from supplementation; the water-soluble vitamins largely are not.
- B. Excess vitamin C is excreted renally and at very high doses predisposes to oxalate stones and gastrointestinal upset. It does not worsen mucosal erosion.
- C. Vitamin B12 is water-soluble with no meaningful toxicity at high intake. Deficiency causes glossitis; excess does not.
- D. High-dose niacin causes cutaneous flushing and, at very high doses, hepatotoxicity. Neither aggravates oral erosions.
Note: ⚠️ SOURCE NOTE. The recall recorded this item with no key and no case detail, and NO vitamin is an established trigger of pemphigus vulgaris. Keyed here to vitamin E as the only option with a defensible mechanism of harm in an eroded, bleeding mouth. The genuinely examinable point is the DRUG trigger: pemphigus is precipitated by THIOL/sulfhydryl-containing drugs — penicillamine and captopril above all — and by ACE inhibitors and some antibiotics. Treat the vitamin framing with caution if you meet it again.