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Granuloma annulare Necrobiosis lipoidica 1. Epidermis not thinned 1. Epidermis usually thinned with effacement of rete ridges 2. Upper part of the reticular dermis usually more involved than the lower part; subcutaneous fat spared in papules 2. Lower part of the reticular dermis (and the upper part of the subcutaneous fat) often more affected than […]