Professional and Linguistic Assessments Board (PLAB) Practice Exam

What is the appearance of the lesions described as pink rings on the trunk and inner surfaces of the limbs that are non-itchy?

1. Erythema multiforme

2. E. marginatum

3. Urticaria

4. Ringworm

The correct answer is: E. marginatum

The appearance of lesions described as pink rings on the trunk and inner surfaces of the limbs that are non-itchy aligns with the characteristics of erythema marginatum. This condition is typically associated with acute rheumatic fever and presents as ring-shaped, pink lesions. They often have a clear center and may fade with time, generally lacking any associated itching. While other conditions could present with ring-like lesions, the non-itchy nature and specific coloration are strongly indicative of erythema marginatum. Erythema multiforme, for instance, can present with target lesions and is commonly itchy. Urticaria typically manifests as wheals that are quite itchy and are not typically ring-shaped. Ringworm, a fungal infection, presents with raised, itchy, scaly patches that have distinct edges, which doesn’t match the description of non-itchy pink rings. Thus, the defining features of the lesions point directly to erythema marginatum as the correct choice.