Erythema elevatum diutinum

Erythema elevatum diutinum (EED) is a rare chronic cutaneous vasculitis characterized by persistent, symmetrically distributed red, violaceous, or yellowish papules, plaques, and nodules, typically located over extensor surfaces of joints such as the knuckles, elbows, knees, and ankles. The condition is also known as extracellular cholesterosis. It primarily affects the skin but can occasionally involve other organ systems. Histologically, EED is classified as a form of leukocytoclastic vasculitis with fibrin deposition in and around dermal blood vessel walls, which over time leads to fibrosis and lipid deposition. EED predominantly affects adults, typically presenting between the ages of 30 and 60 years. The lesions may be asymptomatic or associated with burning, itching, or pain, and can become hardened and nodular over time. The disease has been associated with various systemic conditions, including hematologic disorders (particularly IgA monoclonal gammopathy and myelodysplastic syndromes), autoimmune diseases (such as rheumatoid arthritis and celiac disease), HIV infection, and recurrent streptococcal infections. The association with these conditions suggests an immune complex-mediated pathogenesis. The mainstay of treatment for erythema elevatum diutinum is dapsone (diaminodiphenyl sulfone), which often produces a dramatic clinical response, though lesions may recur upon discontinuation. For patients who cannot tolerate dapsone, alternative treatments include colchicine, niacinamide, tetracycline antibiotics, and topical or intralesional corticosteroids. In cases with significant fibrosis, surgical excision or laser therapy may be considered. Treatment of any underlying associated condition is also important for disease management. The prognosis is generally favorable, with many cases eventually resolving spontaneously over 5 to 10 years, though some patients experience a chronic relapsing course.

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