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What does PEN stand for?

PEN stands for pigmented epidermal nevus

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Looking for online definition of pigmented nevus; pigmented hair epidermal nevus; pigmented keratic precipitates; Pigmented layer; pigmented layer of ciliary body;
quot;Pigmented epidermal nevus is characterized by multiple, scaly, sharply demarcated pigmented papules and plaques in Pugs and Miniature Schnauzers.