Eosinophilic dermatoses are a heterogeneous group of diseases, characterized by an eosinophil-rich infiltrate and/or degranulation of eosinophils. Blood eosinophilia may be an associated feature. Typical, albeit not specific histological findings include 'flame figures', which are caused by the accumulation of cationic proteins released by eosinophils and subsequent collagen denaturation. "Classic" eosinophilic dermatoses include eosinophilic cellulitis (Wells syndrome), granuloma faciale, eosinophilic fasciitis (Shulman syndrome) and eosinophilic folliculitis (Ofuji disease). In addition, there is a multitude of skin diseases that present with varying degrees of eosinophilic infiltration. These include atopic dermatitis, bullous pemphigoid, urticaria, allergic contact dermatitis, prurigo nodularis, arthropod bite reaction, parasitic infections, and drug hypersensitivity. Even though these disorders share a common characteristic (tissue eosinophilia), they differ greatly in their clinical presentation.
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