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Urticarial dermatitis (UD) was first defined 8 years ago. It is characterized by pruritic erythematous papules and plaques resembling urticaria but enduring longer than 24 hours. An association with eczematous lesions is possible. Biopsy samples show normal stratum corneum, minimal spongiosis, and papillary dermal perivascular lymphocytic inflammation with eosinophils; neutrophils may be present. This is a detailed study of patients with clinical and biopsy-proven UD.
These authors retrospectively analyzed clinical and laboratory evaluations and final diagnoses in 146 patients with a clinical diagnosis of UD. Mean age and duration of disease at presentation were 60 years and 1 year, respectively; 60% were women. Nearly all patients had trunc…