Subungual hemorrhage is blood loss just under the nail (the blood becomes trapped between the nail plate and the nail bed ) . The hematomas that are created in this way are characterized by great pain and a dark red to black-brown color of the nail .
The causes are many. Most commonly, subungual hemorrhage is attributed to local trauma , but it can also be a sign of psoriasis , onychomycosis , and eczema . In some cases, the blood loss is made evident by threadlike red-brown lines running longitudinally with respect to the nail ( “splinter” hemorrhages ). This particular orientation is due to the longitudinal shape of the capillaries of the nail bed. “Splinter” hemorrhages are attributable to increased capillary permeability .
In addition to trauma, potentially responsible causes include endocarditis and systemic diseases involving the skin . Splinter hemorrhages may also be associated with renal, pulmonary, and endocrine disorders.
Possible Causes Of Subungual Hemorrhage
Subungual hemorrhage is a common or likely symptom of these diseases
- Infective endocarditis
- Nail biting