Nail Pitting on one finger, is a rare benign self-limited linear dennatosis of unknown origin that follows lines of Blaschko. The condition is most common in children 3-10 years of age [340] but can occur from 6 months to 12 years of age.

It is more common in males. The etiology of lichen striatus is unknown. It presents as the sudden onset of a continuous or interrupted linearly distributed array of small 1-3 mm pink, tan or flesh-colored lichenoid papules.

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The papules may be lichenoid, smooth, scaly or flat topped. It usually involves the entire length of an extremity and may extend far enough along a finger or toe to involve the proximal nail fold and nail plate. It usually involves just one finger, usually the thumb, but more than one f mger involved has been reported. Unilateral lichen striatus has been reported with bilateral onychodystrophy.

Nail changes have been reported to occur before, and concurrently with the cutaneous eruption. Nail involvement has been reported as the only finding; the diagnosis was made based on the clinical appearance, spontaneous clearing of the nail abnormalities and the histopathological findings. Nail involvement in lichen striatus usually

indicates a prolonged course and the nail plate deformity may persist for several years, but cases may be transient and may resolve in less than I year.

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