What causes splinter hemorrhage in nail psoriasis?

Updated: Jun 25, 2021
  • Author: Cindy Li, DO; Chief Editor: William D James, MD  more...
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Splinter hemorrhages are longitudinal black lines due to minute foci of capillary hemorrhage between the nail bed and the nail plate. This is analogous to the Auspitz sign of cutaneous psoriasis, which is the pinpoint bleeding seen beneath the psoriatic plaques.

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