Vigorous exercise-induced unilateral eosinophilic fasciitis: rare and easily misdiagnosed subtype.

The hallmark of eosinophilic fasciitis (EF) is painful symmetric skin stiffness and limb sclerosis with deep fascia inflammation. Two cases of unilateral EF have been reported in the literature but were not related to strenuous physical activity. In this report, a young female presenting with unilateral scleroderma-like skin changes, blood and tissue eosinophilia, and hypergammaglobulinemia proven to be EF after strenuous physical activity is described. This case represents the first case reported in the current literature of unilateral EF after vigorous exercise. A skin to muscle biopsy and magnetic resonance imaging (MRI) study indicated classic EF features. Cases of unilateral eosinophilic fasciitis are under-recognized and have rarely been described in the literature. EF requires a high index of suspicion to be diagnosed accurately and differentiated from another scleroderma variant, especially localized types. Early diagnosis and management of unilateral EF are very crucial because EF management and prognosis are completely different from other scleroderma mimics. EF heals rapidly in response to glucocorticoid or combination therapy. In the current case, corticosteroids alone failed to induce complete disease remission, but with the addition of methotrexate, complete resolution of both skin and systemic features was obtained. She is now in good health with no medication use. The current literature review indicates that this the first reported case of unilateral EF after vigorous exercise.