10 Nail Changes That May Indicate an Underlying Health Issue

7. Pitted Nails - Autoimmune and Inflammatory Conditions

Nail pitting, characterized by small punctate depressions or holes in the nail surface, serves as an important clinical marker for various autoimmune and inflammatory conditions, most notably psoriasis, alopecia areata, and eczema. These tiny depressions form when inflammation disrupts the normal nail matrix function, creating focal areas of defective keratin production that appear as pits when the nail grows out. Psoriatic nail disease affects approximately 50% of patients with psoriasis and up to 80% of those with psoriatic arthritis, with nail pitting being one of the earliest and most common manifestations. The pattern, depth, and distribution of pits can provide diagnostic clues, with psoriasis typically causing irregular, deep pits scattered across the nail surface, while alopecia areata tends to produce more uniform, geometric patterns of shallow pitting. Eczema-related nail changes often include pitting combined with other features such as ridging, thinning, or discoloration, reflecting the chronic inflammatory nature of the condition. The severity of nail pitting often correlates with disease activity in the underlying condition, making nail examination a valuable tool for monitoring treatment response and disease progression. Other conditions that can cause nail pitting include reactive arthritis, Reiter's syndrome, incontinentia pigmenti, and certain genetic disorders affecting ectodermal development. Treatment of nail pitting focuses primarily on managing the underlying inflammatory condition through topical or systemic therapies, though nail changes may persist for months after successful treatment due to the slow rate of nail growth and replacement.