A condition similar to erythema nodosum, erythema induratum is a type of panniculitis that affects the calves. It typically appears in individuals who have large amounts of subcutaneous fat, thick ankles, or poor arterial blood supply. For many years, healthcare professionals considered erythema induratum and nodular vasculitis to be the same disease. However, in modern medical texts, physicians tend to make a distinction between the two. Both conditions cause chronic and painful nodules which may result in scarring, but the prognosis is generally optimistic with proper treatment.

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