Final answer:
Nail pitting, onycholysis, and dactylitis can be symptoms of a medical condition known as psoriatic arthritis. This condition can cause a sausage-like appearance of the affected digit and destruction of the interphalangeal joints.
Step-by-step explanation:
Nail pitting, onycholysis, and dactylitis can be symptoms of a medical condition known as psoriatic arthritis. Psoriatic arthritis is a type of inflammatory arthritis that affects people with psoriasis, a skin condition. The combination of nail pitting (small depressions on the surface of the nails), onycholysis (separation of the nail from the nail bed), and dactylitis (swelling of an entire digit) can lead to a sausage-like appearance of the affected finger or toe. Furthermore, psoriatic arthritis can cause destruction of the interphalangeal joints, which are the joints between the phalanges (finger or toe bones).