Nail Signs Splinter Haemorrhages 指甲裂片形出血

Splinter Haemorrhages appear as one or more red–brown to purple–black, thin longitudinal lines in the distal portion of the nail. The shape of the subungual hemorrhages is due to the longitudinal orientation of nail bed capillaries. The most common cause of splinter hemorrhages is trauma, followed by psoriasis, onychomycosis, and occasionally medications. Proximal splinters are rare and possible indicators of systemic diseases, including endocarditis (infectious and marantic), vasculitis (including septic vasculitis), trichinosis, and the antiphospholipid antibody syndrome.

Approximately 30% of patients with tuberous sclerosis complex have “red comets”, i.e. short red longitudinal streaks of the nail with an enlarged distal end. They are partially blanchable and are thought to represent telangiectasias plus extravasated blood.





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  3. Calvert HT, Smith MA, Wells RS. Psoriasis and the nails. Br J Dermatol 1963;75:415–18.