How is finger inflammation caused, and why without any wounds, it happens for no reason

Patient's question:

There are no symptoms

Doctor's answer:

The skin on the palmar surface of the distal phalanx and the periosteum of the nail bone are interwoven with many longitudinal fibers, which classify the soft tissue into numerous closed cavities. These cavities contain adipose tissue and a rich network of nerve endings. When infection occurs, pus is not easily diffused to surrounding areas.