Hereditary angioedema (HAE) is a genetic disorder that causes sudden episodes of swelling, often accompanied by abdominal pain. Affecting roughly 1 in 50 000 people, HAE typically appears in childhood ...

Figure 3 (A) H&E, 10×—mild to moderate spongiosis with dense perivascular and periadnexal infiltrate in the superficial and deep dermis. (B) H&E, 40×—the infiltrates consist mainly of neutrophils with ...