Lump under the skin on the back of the neck

A small tender node may react to an infection near the scalp, ear, or throat. A cyst may feel smooth and move slightly beneath the skin; an inflamed cyst can become sore or red. Head and Neck Cancer, Lymphoma, Thyroid Cancer, and Cancer of Unknown Primary may enter a clinician’s differential when examination reveals persistent, firm, fixed, or otherwise unusual tissue. That clinical list is not a diagnosis and should not be used to label the lump at home.

Check the area only enough to describe it accurately. Write down its approximate size, when it appeared, whether it moves, and whether it changes after an illness. Arrange a medical appointment if it lasts, enlarges, or has no obvious cause. Examination may include the scalp, ears, mouth, throat, thyroid area, and other neck nodes. Depending on findings, a clinician may recommend observation, ultrasound, or tissue testing.

Seek urgent care for breathing or swallowing difficulty, rapidly worsening swelling, severe infection symptoms, or redness spreading away from the lump. Request timely assessment for a hard or immobile lump, unexplained voice change, persistent throat symptoms, drenching night sweats, or unexplained weight loss.

Ask which tissue seems involved, whether nearby infection could explain the finding, and what timeframe is appropriate for review. Ask how an ultrasound differs from a needle sample, what symptoms should change the plan, and whether thyroid or throat examination is relevant.