← | Toenail psoriasis pictures Onychodystrophy or nail psoriasis is one of the most common forms of this disease. It affects nail plates and phalanges of fingers. At the first stage of the disease, nails become brittle, and then they change color. The nails often begin to crumble (the symptom similar to the effect of fungus). The advanced stage of onychostrophy might represent itself with onycholysis or complete dissolution of the nail. | → |