psoriatic arthritis - pitted nails and fusiform swelling - "sausage digit" - Up to 80% of patients exhibiting pitting, ridging, discoloration, loss of the nail, or thickening of the skin under the nail tip (subungual hyperkeratosis) will develop joint disease, especially of the distal interphalangeal articulations
This is What Your Fingernails Are Warning You About: organ failure, inflammation, or worse
8 Health Warning Signs your FINGERNAILS may be sending you. If you have: Discolored Nails Nails Split Nails Concave (spoon shaped) Nails Pitted Nails Ridges in your Nails Dry, Brittle Nails Clubbed Nails.
fingernail pitting from psoriasis-Rippled Nails If the nail surface is rippled or pitted, this may be an early sign of psoriasis or inflammatory arthritis. Discoloration of the nail is common; the skin under the nail can seem reddish-brown.