Damaged nails are the pits

Psoriasis of the nails can be a major cosmetic and functional problem for patients with this condition. 

Severe involvement of the nail matrix under the posterior nail fold can lead to marked dystrophy of the nail and be misdiagnosed as a fungal infection.

However, milder matrix involvement gives rise to pitting of the nails, as in this case where the abnormal keratin on the nail surface is washed away, leaving the small holes or pits. 

These nails also show features of nail bed psoriasis involvement with a yellowish oil spot sign in some areas, and onycholysis of