What could be the cause of a lump on the large tendon on the right side of the neck?

A lump on the large tendon on the right side of the neck may be caused by conditions such as lipoma, fibroma, or lymph node swelling. The specific causes are analyzed as follows:

1. Lipoma

When lipid metabolism in the skin of the neck becomes significantly abnormal, a localized lump may develop. This is a benign condition and has minimal impact on the body. If it does not affect physical appearance, treatment is usually unnecessary.

2. Fibroma

When fibrous connective tissues in the body undergo abnormal proliferation, a noticeable lump may appear locally. It is typically small, about 1–3 cm in size, firm to the touch, and generally causes no discomfort. After diagnosis of fibroma, regular follow-up visits at the hospital are recommended.

3. Lymph nodes

Lymphatic tissue is distributed throughout the body. Under normal circumstances, lymph nodes cannot be felt. However, when they are invaded by viruses, bacteria, or tumor cells, lymph nodes may become swollen. In more severe cases, symptoms such as local pain or skin ulceration may also occur.

In addition to the above causes, lumps may also result from factors such as venous sinuses. If there is obvious pain or skin ulceration at the site, medical evaluation at a hospital is necessary to determine the underlying cause and initiate appropriate treatment.