Reactive Skin Rash - Differential Diagnosis Algorithm

Reactive erythematous with various morphology

 • Urticaria - Firm / edematous papules & plaques that are transient & itchy. Usually lasts <24hrs

 • Erythema Nodosum - Tender or painful red nodules on shins

 • Erythema Multiforme - Target lesions possibly with macules, papules, vesicles &/or bullae on palms soles and mucous membranes



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