Urticarial dermatitis is characterized by normal stratum corneum, mild epidermal edema with minimal spongiosis, and a superficial to mid-dermal perivascular infiltrate of lymphocytes and eosinophils with occasional neutrophils. However, these features are nonspecific and may be seen in a variety of skin conditions, including drug reactions, arthropod assault, viral infections, and prodromal stage of bullous pemphigoid.
