How is Wells’ syndrome diagnosed?
Skin biopsy is the diagnostic method of choice. A complete blood count may show a high number of eosinophils.
Skin biopsy will show a high number of eosinophils in the skin and underlying tissue, along with patterns of inflammation that are consistent with Wells’ syndrome but not with other possible causes of inflammation such as allergy, parasites, dermatitis, insect bites, or Churg-Strauss syndrome.