Severe Mosquito Bite Allergy

**Semantic type:** Disease or Syndrome

**Definition:** An EBV-positive NK-cell lymphoproliferative disorder characterized by high fever and intense local skin symptoms, including erythema, bullae, ulcers, skin necrosis, and deep scarring following mosquito bites. Patients have NK-cell lymphocytosis in the peripheral blood and an increased risk of developing hemophagocytic syndrome and progressing into overt NK/T-cell lymphoma or aggressive NK-cell leukemia in the longstanding clinical course. (WHO 2017)