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Erythema nodosum Nodular vasculitis 1. No ulceration 1. Ulceration often 2. Sparse infiltrate of lymphocytes around venules in the dermis 2. Dense, mixed infiltrate of inflammatory cells throughout the lower part of the dermis 3. Involvement mostly of septa in the subcutaneous fat 3. Involvement mostly of lobules, rather than septa, in the subcutaneous fat […]