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What is Beaus lines and explain in detail?
Beaus lines are deep grooved lines that run from side to side on the fingernail or the toenail. They may look like indentations or ridges in the nail plate.: 657   This condition of the nail was named by a French physician, Joseph Honoré Simon Beau (1806–1865), who first described it in 1846.

Signs and symptoms
Beaus lines are horizontal, going across the nailline, and should not be confused with vertical ridges going from the bottom (cuticle) of the nail out to the fingertip.  These vertical lines are usually a natural consequence of aging and are harmless.Beaus lines should also be distinguished from Muehrckes lines of the fingernails.  While Beaus lines are actual ridges and indentations in the nail plate, Muehrcke lines are areas of hypopigmentation without palpable ridges; they affect the underlying nail bed, and not the nail itself. Beaus lines should also be distinguished from Mees lines of the fingernails, which are areas of discoloration in the nail plate.
As the nail grows out, the ridge in the nail can be seen to move upwards until it reaches the fingertip