Transverse lines or grooves across the fingernails; transverse
depressions in the nail plate. Beau's lines are caused by temporary cessation of
cell division in the proximal nail matrix. The condition may be caused by local
disease of the nail fold, physical trauma to it, or a systemic insult, such as an
illness or a drug as, for example, chemotherapy. Named for the distinguished French
physician Joseph Honoré Simon Beau (1806-1865) who described this phenomenon in
1846.
A lso known as Beau-Reil cross furrows. Johann Christian Reil (1759-1813), German
anatomist, physiologist, and physician for the poet Johann Wolfgang von Goethe,
described the same lines across the nails in 1796, a half century before Beau.
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