In children, infection is the most common cause of neck lumps, So before an imaging test is done, children are usually first given antibiotics to see if the lumps go away. read more is preferred for children to avoid radiation exposure and may be used in adults if doctors suspect a thyroid mass. A device called a transducer converts electrical current into sound waves. Ultrasonography Ultrasonography Ultrasonography uses high-frequency sound (ultrasound) waves to produce images of internal organs and other tissues. MRI does not use x-rays and is usually very safe. read more (CT) or magnetic resonance imaging Magnetic Resonance Imaging (MRI) In magnetic resonance imaging (MRI), a strong magnetic field and very high frequency radio waves are used to produce highly detailed images. In modern scanners, the x-ray detector usually. Tests often include blood tests and computed tomography Computed Tomography (CT) In computed tomography (CT), which used to be called computed axial tomography (CAT), an x-ray source and x-ray detector rotate around a person. For older people, particularly those with warning signs or risk factors for cancer, doctors often do several tests to look for a source of cancer before they remove a piece of the lump (a needle biopsy) or the entire lump for testing (an excisional biopsy). If younger people have no risk factors for cancer or findings that suggest cancer (such as mouth growths), imaging tests are often done, sometimes followed by biopsy. In very low doses, x-rays are used to produce images that help doctors diagnose disease. Most other people should have a complete blood count (CBC) and a chest x-ray Plain X-Rays X-rays are high-energy radiation waves that can penetrate most substances (to varying degrees). In such infections, the infected nodes are quite tender to the touch. Swollen lymph nodes are more likely to be caused by an infection than cancer. Causes Causes of a hard lump under the skin can include: Cysts A cyst is a closed pocket of tissue that contains fluid or debris. This species of bacteria normally resides in the crevices between the teeth and gums. This might cause a painless lump in the neck. read more, and actinomycosis Actinomycosis Actinomycosis is a chronic infection caused mainly by the anaerobic bacteria Actinomyces israelii. Infection occurs when people unknowingly ingest toxoplasma cysts from cat feces or eat contaminated meat. read more, toxoplasmosis Toxoplasmosis Toxoplasmosis is infection caused by the protozoan parasite Toxoplasma gondii. ![]() These infection include cat-scratch disease Cat-Scratch Disease Cat-scratch disease is infection caused by the gram-negative bacteria Bartonella henselae and transmitted by a scratch or bite from an infected cat, often causing a crusted bump and swollen. (See also Overview of Bacterial Skin Infections.) Lymph is a fluid that oozes out of the body's. Sometimes bacteria can directly infect a lymph node (called lymphadenitis Lymphadenitis Lymphadenitis is infection of one or more lymph nodes, which usually become swollen and tender.
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