A lump on the finger without pain or itching may be caused by lipoma, tendon cyst and so on. 1. Lipoma: Lipoma may be related to heredity, chronic inflammation, systemic lipid metabolism abnormality and other factors, it can occur in any part of the body where there is fat, manifested as one or more lumps under the skin, with no other self-conscious symptoms, when the growth of the lipoma is too large and presses the nearby nerves, it may cause pain and numbness. 2. Tendon sheath cysts: tendon sheath cysts may be related to the degeneration of joints and long-term injuries and other factors, occurring in the joints, ligaments or tendons near the human body, manifested as the appearance of different sizes of hemispherical bulges under the skin, usually no obvious symptoms, when the cysts are too large, there may be localized pain, numbness of distal end and other symptoms. There is a bag on the finger painless, itchy, there may be other causes, it is recommended to go to the hospital in a timely manner to improve the examination, to clarify the cause of the disease to give targeted treatment.