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collarette
(kol″әr-etī)
a narrow rim of loosened keratin overhanging the periphery of a circumscribed skin lesion, attached to the normal surrounding skin.
an irregular jagged line dividing the anterior surface of the iris into two regions, the pupillary zone and the ciliary zone.
Biett collarette
a type of papular syphilid in which the central papule is surrounded by a ring of scales.

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