The physical characteristics of nail psoriasis, which appear in the fingernails and toenails, include discoloration, change in surface appearance, buildup of organic white material beneath the nail bed, thickening and separation from the surrounding nail bed, as noted by WebMD. Psoriasis may cause one or more symptoms and can sometimes occur with other nail problems, such as fungal infections. In addition to changing the physical appearance and texture of nails, psoriasis can cause pain and tenderness, especially when it separates nails from the underlying beds.
Psoriasis symptoms may vary in severity among individuals and sometimes mimic symptoms of other nail conditions. One sign of nail psoriasis is discoloration, which appears on the nail bed or below the nail's surface. Nails with psoriasis might turn brown, green or yellow. Some people report having white or red spots beneath the nails' surfaces too. Some patients see changes in nail texture, including development of ridges, grooves and small holes in the nail. Thickening of nails may indicate psoriasis; this symptom usually stems from a concurrent fungal infection. Brittle and fragile nails may also develop from secondary infections.
Some changes to the nails from psoriasis create pain and tenderness in affected areas, limiting mobility in hands and feet. For care, health experts recommend keeping nails trimmed short, rounding nail edges with a file, wearing comfortably loose footwear and using moisturizer in the winter.