Disorders that can produce nail deformities include psoriasis, lichen planus, and chronic paronychia causing the end of the nail to separate from the underlying skin. Bacteria can enter this space and make the nail turn a blackish green.

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Injury to the nail bed caused by continuous pressure from ill-fitting shoes or poor circulation caused by arteriosclerosis can lead to thickening of the whole nail. Many disorders can produce nail deformities. Psoriasis, lichen planus, and chronic paronychia can cause the end of the nail to separate from the underlying skin. Bacteria can enter this space and make the nail turn a blackish green. Iron deficiency anemia can cause spooning of the nails. Congenital heart disorders and lung cancer can cause clubbing, or knobby ends of the fingers or toes, and then cause the nails to grow around these ends.

Disorders That Can Produce Nail Deformities Include Psoriasis, Lichen Planus