Which finding is a major Jones criterion for acute rheumatic fever?

• A. Erythema marginatum
• B. Erythema multiforme
• C. Urticaria
• D. Purulent bullae

Answer: (A)

Erythema marginatum is one of the major Jones criteria for acute rheumatic fever. The major criteria include erythema marginatum, migratory polyarthritis, carditis, subcutaneous nodules, and Sydenham chorea. Erythema marginatum is a nonpruritic, ring-shaped rash that often appears on the trunk and proximal limbs and can be transient. Its presence reflects the inflammatory process after a group A streptococcal infection, supporting the RF diagnosis. The other skin findings listed—erythema multiforme, urticaria, and purulent bullae—are not part of the Jones criteria and do not specifically indicate acute rheumatic fever.