What causes a hard lump after having an indwelling needle for 20 days, and what should be done?

Under normal circumstances, the presence of a hard lump 20 days after catheter placement may be caused by inflammation, foreign body residue, blood stasis, hematoma, infection, or other reasons. As the causes vary, so do the treatment methods. Specific details are as follows:

1. Inflammation

Inflammatory response is part of the tissue healing process. The body produces fibroblasts, which participate in wound repair and scar tissue formation. The留置针 or catheter can irritate surrounding tissues at the insertion site, possibly triggering scar tissue formation and causing a sensation of hardness. Patients may take medications such as ibuprofen sustained-release capsules or diclofenac sodium sustained-release tablets under medical guidance.

2. Foreign Body Residue

During insertion or removal of the留置针 or catheter, small fibers or fragments may occasionally remain near the wound. Such foreign bodies may trigger an inflammatory reaction, leading to the feeling of a hard lump. Patients may use medications such as calcium dobesilate capsules or azithromycin dispersible tablets as directed by a physician.

3. Blood Stasis (Congestion)

The presence of the留置针 may obstruct normal blood circulation in the surrounding tissues. This accumulation of blood can lead to congestion and local tissue swelling. Patients may gently massage the area or apply a warm towel compress; in most cases, the condition gradually resolves on its own.

4. Hematoma

To control bleeding, the body forms a hematoma capsule to prevent further blood loss. Fibrous tissue within the hematoma capsule can create a sensation of firmness. Patients may use medications such as glucosamine hydrochloride capsules or Huoxue Zhitong capsules under a doctor's supervision.

5. Infection

Infection triggers a local inflammatory response, including the release of inflammatory mediators and accumulation of immune cells. These responses can cause tissue swelling and formation of a hard lump. Patients may take roxithromycin dispersible tablets or clarithromycin capsules as prescribed.

In summary, a hard lump detected 20 days after留置针 placement may result from multiple causes. If patients experience discomfort or unusual symptoms, they should seek timely medical evaluation to avoid serious complications.