Clinical examination can be the key to pursuing a diagnosis, even in rare diseases. The "groove sign" is a typical finding in eosinophilic fasciitis and can be elicited by elevation of the arm to allow for venous return with visible "grooving" of the veins due to skin thickening.
Keywords: eosinophilia; eosinophilic fasciitis; immunosuppression; localized scleroderma.
© 2020 The Authors. Clinical Case Reports published by John Wiley & Sons Ltd.