Proximal Distal

Psoriasis Chemical injury

Lichen planus (Figure 3.41) Old age Retinoid therapy (Figure 3.43) Repeated wetting

Chondrodysplasia punctata of the nails (X-linked) _Polycythaemia vera_

FURTHER READING Herringbone nails

Parry EJ, Morley WN, Dawber RPR (1995) Herringbone nails: an uncommon variant of nail growth in childhood? Br J Dermatol 132: 1021-1022.

Trachyonychia

Baran R, Dawber RPR (1987) Twenty nail dystrophy of childhood: a misnamed syndrome, Cutis 39:481-482.

Tosti A, Fanti PA, Morelli R, Bardazzi F (1991) Trachyonychia associated with alopecia areata: a clinical and pathological study, J Am Acad Dermatol 25:266-270. Tosti A, Bardazzi F, Piraccini BM, Fanti PA (1994) Trachyonychia (twenty nail dystrophy): clinical and pathological study of 23 patients, Br J Dermatol 131:866-872.

Onychoschizia

Shelley WB, Shelley ED (1984) Onychoschizia: scanning electron microscopy, J Am

Acad Dermatol 10:623-627.

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