Urticaria

Circumscribed, raised, edematous, red plaques surrounded by faint white halo. (Courtesy Dr. S. Walsh)

Erythema Multiforme EM No.2

The macules and papules can have various appearances but tend to be monomorphic in a given patient. (Courtesy Dr. S. Walsh)

Erythema Multiforme EM – No.1

Macules/papules with concentric, light and dark erythematous rings. (Courtesy of Women’s College Hospital Slide Library, Toronto)