Equestrian perniosis is localized to the lateral thighs. Rarely, buttock involvement has been reported. Red or violaceous plaques or nodules appear after cold exposure, sometimes as soon as 24-48 hours thereafter. Lesions may be accompanied by mild to moderate pruritus, burning, or tenderness, or they may be asymptomatic. Most cases are self-limited, although more severe cases can lead to blistering and ulceration. Hyperpigmentation and scarring may occur upon resolution.
T69.1XXA – Chilblains, initial encounter
37869000 – Chilblains
Differential Diagnosis & Pitfalls