Erythema multiforme (EM) represents a spectrum of acute, immune-mediated mucocutaneous conditions that predominantly affect the skin and, in many instances, the oral mucosa. Typically presenting with ...

Classically, pityriasis rosea begins as an erythematous, scaly patch on the trunk, known as a herald patch. This large lesion is commonly 2–10 cm in diameter, ovoid, erythematous and slightly raised, ...