Patients with untreated streptococcal pharyngitis can develop erythema marginatum, a fleeting pink or red rash with central clearing that can appear, disappear, and reappear within hours. This is a hallmark feature of rheumatic fever and is usually accompanied by other signs such as migratory arthritis, carditis, subcutaneous nodules, and Sydenham chorea. What is the hallmark feature of rheumatic fever?
1) Erythema marginatum
2) Migratory arthritis
3) Carditis
4) Subcutaneous nodules
5) Sydenham chorea