A person who rides a horse in cold weather may develop panniculitis in the legs.
Clinical features:
(1) The condition usually occurs in young women.
(2) There is a history of horse riding in cold weather.
(3) The rider is usually wearing riding breeches that are tight and with little insulation.
(4) The rider develops violet or red plaques on the legs.
(5) The lesions appear on the upper out thighs (superolateral).
Complications:
(1) Ulceration of the lesions.
(2) Scarring with postinflammatory hyperpigmentation.
The presence of cold agglutinins increases the risk. If cold agglutinins are present then the rider may have other signs of cold agglutinin disease, especially in the ears, nose and/or digits.
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