Nail psoriasis is characterized by which of the following features?

Nail psoriasis is characterized by vertical depressions down the nail plate, a condition known as pitting. This symptom occurs due to the abnormal growth cycle of the skin cells and the interaction between the nail matrix and underlying tissues, which causes the nail to form irregularities. The presence of these depressions is a key indication of nail psoriasis and helps differentiate it from other nail conditions.

While discoloration, separation from the nail bed, and thickening can occur in various nail disorders, they are not specific features of nail psoriasis. Pitting, on the other hand, directly relates to the specific pathology of psoriasis and is one of the primary characteristics that indicate this condition. Thus, understanding these typical manifestations aids in diagnosing and distinguishing nail psoriasis from other nail disorders.