Psoriasis. At the time that psoriatic (pathological) change involves nail "root"(matrix), the nails would be psoriatic when they form and grow out.
Same appendeges. Nali, hair .. Skin are cousins i.E come from same same appendages and is autoimmune disease , can affect any organ.
Psoriasis. Pitting of the nails is a symptom of psoriasis. Nail pitting is small depressions in the nails. Nail pitting is most common in people who have psoriasis — a condition characterized by scaly patches on the skin. Nail pitting can also be related to connective tissue disorders, such as reiter's syndrome, and alopecia areata — an autoimmune disease that causes hair loss.