A previously healthy 61-year-old woman presented to the outpatient clinic for angiology with a rash on both lower legs after a strenuous hiking tour. The patient had not been injured and there was no itch or pain associated with the rash. She had no arthralgias, abdominal pain, fever, malaise or weight loss. The patient was not taking any medication. A similar episode, which occurred after a hiking tour a few years previously, resolved spontaneously within one week. On examination, she had slight edema and petechiae on both lower legs without ulceration; an area of skin compressed by the sock cuff was spared bilaterally (Figure 1). Digital pulse oscillography and doppler ultrasonography of the vessels of the lower limb were normal. Results for her complete blood cell count, renal function, C-reactive protein, erythrocyte sedimentation rate, serum protein electrophoresis, antineutrophil cytoplasmic antibodies, subtypes of antinuclear antibodies, C1q antibodies, cryoglobulins and complement factors were within physiologic ranges. We did not find any coagulopathy. We concluded that this was exercise-induced vasculitis. The patient’s symptoms resolved within six days without treatment.
Petechial skin rash on the medial lower legs of a 61-year-old woman who had just finished a strenuous hiking tour. The area of skin that was compressed by the sock cuff was spared.
Exercise-induced vasculitis is a small-vessel vasculitis affecting the lower legs that occurs after strenuous sports activity such as running or hiking, particularly during hot weather. It is more common in women over 50 years of age and presents with petechial or urticarial rash with edema, itch or pain in an otherwise healthy patient. The skin area compressed by the sock cuff is characteristically spared.1
Sports activity in hot weather may increase circulating immune complexes and complement activation,2 which leads, together with muscle fatigue and impairment of venous drainage, to the development of petechiae and vasculitis. A skin biopsy may show leukocytoclastic vasculitis.1,3
Exercise-induced vasculitis is self-limiting and resolves after a few days. Nonsteroidal antiinflammatory drugs, topical corticosteroids and elevation of the affected legs may reduce symptoms.3 Although a patient’s history and clinical findings may suggest exercise-induced vasculitis, any investigation should exclude autoimmune disorders or coagulopathies.
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Footnotes
Competing interests: None declared.
This article has been peer reviewed.
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