Heberden's nodules are special bony swellings that develop between the distal interphalangeal joints of the hands affected by arthritis.
The distal interphalangeal joints are those articular elements interposed between the second and third phalanges of the fingers.
Heberden nodules - Image from en.wikipedia.org
The presence of Heberden's nodules can be responsible for various disorders, including: pain in bending the fingers, loss of mobility, joint stiffness and swelling.
Unfortunately, at the present time, there are no specific treatments against Heberden's nodules, but only symptomatic remedies.