Progressive cribriform and zosteriform hyperpigmentation

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Abstract
Five cases of progressive cribriform and zosteriform hyperpigmentation are described. The following criteria were fulfilled: uniformly tan cribriform macular pigmentation in a zosteriform distribution; a histologic pattern that consisted of a mild increase in melanin pigment in the basal cell layer and complete absence of nevus cells; no history of rash, injury, or inflammation to suggest post-inflammatory hyperpigmentation; onset well after birth with gradual extension; and lack of other associated cutaneous or internal abnormalities. This appears to be a newly described entity, although it resembles a Becker''s nevus without hypertrichosis or an atypical cafe au lait spot. Such progressive cribriform and zosteriform pigmentation may not be uncommon.

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