Morning stiffness and pain in small joints of hands or feet, lasting for more than an hour, feeling fatigue, affecting symmetrical joints (both hands, not only one hand), are symptoms of rheumatoid arthritis.
Presence of hard lumps (sometimes painful), located over the finger knuckles, are known as rheumatoid nodules, since are an exclusive feature of rheumatoid arthritis.
Some patients with rheumatoid arthritis get these nodules within two years of disease onset.
See internist rheumatologist for proper treatment in order to achieve suppression of the inflammatory process and resulting damage in the affected joints!

Best wishes!
Marija