What is a common symptom of nail psoriasis?

Pitting and discoloration are hallmark symptoms of nail psoriasis. In this condition, the cells in the nail matrix become inflamed, leading to the development of small depressions or "pits" on the nail surface. The nails may also exhibit changes in color, ranging from yellow to brown, due to the involvement of skin beneath the nail and the accumulation of substances associated with psoriasis.

While other options describe various nail conditions, they do not specifically relate to nail psoriasis. Increased rigidity and growth may occur with other nail disorders or even as a result of general nail health. Extreme softness and flaking can be indicative of a fungal infection or other dermatological conditions rather than psoriasis. Deep ridges and shine do not correlate uniquely with nail psoriasis either, as they can be seen in other situations like nail trauma or other systemic diseases. Thus, the distinct symptoms of pitting and discoloration are central to recognizing nail psoriasis.