<prompt> A 25-year-old woman develops extensive pruritic wheals following ingestion of seafood to which she was allergic. While these lesions are usually not biopsied, a biopsy would probably show which of the following features?Dilated superficial lymphatic channelsGranular complement and IgG at dermalepidermal junctionMicroscopic blistersMunro microabscesses  <response>: Uicaria hives are pruritic wheals that form after mast cells degranulate and trigger localized dermal edema with dilated superficial lymphatic channels. The mast cell degranulation is sometimes, but not always, triggered by IgE-antigen interactions. Granular complement and IgG deposition at the dermalepidermal junction is a characteristic of systemic lupus erythematosus. Microscopic blisters are a characteristic of dermatitis herpetiformis. Munro abscesses are a characteristic of psoriasis. Ref: Kaplan A.P. 2012. Chapter 38. Uicaria and Angioedema. In L.A. Goldsmith, S.I. Katz, B.A. Gilchrest, A.S. Paller, D.J. Leffell, N.A. Dallas Eds, Fitzpatricks Dermatology in General Medicine, 8e. 