Which condition is a serious drug reaction with fever and mucosal involvement, requiring emergent referral?

• A. Pemphigus vulgaris
• B. Stevens-Johnson Syndrome/Toxic Epidermal Necrolysis
• C. Erythema multiforme
• D. Discoid lupus

Answer: (B)

This scenario highlights a severe drug-induced reaction that presents with fever and mucosal involvement and needs urgent referral. The condition is Stevens-Johnson Syndrome/Toxic Epidermal Necrolysis, a spectrum where a medication triggers rapid, widespread damage to the skin and mucous membranes. The fever signals a systemic inflammatory response, while mucosal erosions in the mouth, eyes, and genitals are typical and help distinguish it from more benign rashes. Because the epidermis separates from underlying tissue, patients can lose fluids, become dehydrated, and develop life-threatening infections, so they require immediate evaluation in a specialized setting (often a burn unit or intensive care) with cessation of the offending drug and intensive supportive care.

Context helps in recognizing it: common culprits include certain antibiotics (like sulfonamides), anticonvulsants, allopurinol, and some NSAIDs, with onset usually 1–3 weeks after starting the drug. In contrast, conditions with some mucosal involvement but different driving factors and courses—such as autoimmune blistering diseases that are less acutely drug-related, or infections-associated rashes—do not typically present as an urgent drug reaction with systemic instability.