_1. A vertical splitting or separation of the nail plate in column layers at the distal (free) edge of the nail plate.
_2. It is described as an extreme thickening curvature of the nails, usually it is caused by varying degree of hyperkeratosis.
_3. A condition of the nail plate which separates from the nail bed and curves at the free edge.
_4. Nail condition in which the cuticle splits around the nail.
_5. A chronic infammation of the nail fold and nail bed (matrix).
_6. It is referred to ingrown nail which affect the gingers and toenails.
_7. An infectious disease caused by a vegetable parasite.
_8. A deformity of the nail plate caused by biting nails.
_9. An overgrowth of cuticle which sticks to the surfaces of nail plate.
_10. It is caused by uneven growth of the nails, usually resulting from illness.

A. Blue nails
B. Brittle nails
C. Claw nails
D. Eggshell nails
E. Hangnails
F. Ridges
G. Onychia
H. Onychocrytosis
I. Onychomycosis
J. Onychophagy or bitten nail
K. Ptery gium