What causes a hard lump on the middle finger, and what should be done about it?
In general, a hard lump on the middle finger may be caused by prolonged friction, post-traumatic scarring, muscle tendon sheath cysts, bone spurs, or fibromas. If any abnormalities occur, it is recommended to seek medical attention promptly. Specific analyses are as follows:
1. Prolonged Friction
When the middle finger experiences prolonged friction—such as from frequent mouse use or writing—the local skin's stratum corneum may thicken and form a hard lump. These lumps are typically painless and non-swollen, with clear boundaries and a firm texture. No special treatment is required; symptoms can be relieved by reducing friction and using hand creams.
2. Post-Traumatic Scarring
After an injury to the middle finger, scar tissue may form during the healing process, appearing as a hard lump. Such lumps are usually associated with a history of trauma and may differ in color from the surrounding skin. Mild scars can be improved through massage or scar treatment products; severe cases may require laser therapy or surgical removal.
3. Tendon Sheath Cyst
Repetitive hand movements over time—such as typing or playing musical instruments—can cause fluid accumulation around tendons, forming a cyst. The cyst may move with tendon motion and is usually painless, though it may cause pain if it compresses a nerve. Warm compresses and massage may help relieve symptoms. In some cases, a doctor may aspirate the fluid or recommend surgical removal.
4. Bone Spur
Long-term joint wear or inflammatory irritation can lead to compensatory bone growth, resulting in a bone spur. This condition may be accompanied by pain and joint stiffness, affecting finger dexterity. Under medical guidance, nonsteroidal anti-inflammatory drugs (NSAIDs) such as acetaminophen tablets, loxoprofen sodium tablets, or indomethacin tablets may be used to alleviate pain and reduce inflammation. Surgical removal of the bone spur is also an option.
5. Fibroma
Fibromas result from abnormal proliferation of fibrous tissue and commonly occur under the skin or near tendons, associated with factors such as genetics or local trauma. They are usually painless but may impair finger movement as the tumor grows. Small fibromas can be surgically removed. Postoperative care includes rest, infection prevention, and regular follow-up visits.
In daily life, maintaining a healthy lifestyle and improving dietary habits are important. Take regular breaks while writing, massage areas subjected to pressure, and minimize friction.