dermatologic disorders
Nail Deformities and Dystrophies
Nail deformities associated with dermatologic conditions
 Psoriasis , Lichen Planus of the nail matrix Alopecia Areata None This photo shows irregular pits and areas of yellow-brown discoloration (oil spots) in a person with psoriasis. © Springer Science+Business Media Nail bed psoriasis causes onycholysis (as evidenced by the white discoloration of the distal nails with erythematous border and absence of distal nail on the ring and little fingers). The underlying nail bed is hyperkeratotic. © Springer Science+Business Media The photo on the left shows thickening and crumbling of the nail of the great toe. Pitting and onycholysis are visible on the hand (right), suggesting nail psoriasis as the diagnosis. © Springer Science+Business Media This photo shows longitudinal ridging of the thumbnail of a patient with lichen planus of the nail. DR P. MARAZZI/SCIENCE PHOTO LIBRARY This photo shows dorsal pterygium of several nails accompanied by atrophy of the nails. © Springer Science+Business Media 