A patient presents with a diffuse swelling of the upper lip caused by permeability of deeper blood vessels. The skin covering the swelling appears normal and not accompanied by itching. This is characteristic of what pathological condition?

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The diffuse swelling of the upper lip caused by permeability of deeper blood vessels and the absence of itching is characteristic of angioedema. Minor aphthous ulcers present as painful ulcers in the oral mucosa, lichen planus presents as white, lacy patches on the mucous membranes, and Sjögren syndrome presents with dry eyes and dry mouth.

A Patient Presents with a Diffuse Swelling of the Upper