What causes a lump on the back of the neck?

Lymph nodes can enlarge while responding to a scalp, ear, throat or respiratory infection. A lump arising within the skin may be a cyst or inflamed hair follicle, while a soft mobile lump beneath it may be a lipoma. Head and neck cancer, lymphoma and thyroid cancer can present with a neck lump, but the symptom itself does not determine the diagnosis.

Position helps identify which tissue may be involved. Lumps high at the back of the neck can relate to lymph nodes draining the scalp, whereas a superficial bump with a central opening may arise from the skin. Tenderness, redness and warmth favour inflammation, although these signs cannot confirm the cause.

During examination, a clinician checks size, texture, mobility, skin changes and other lymph-node areas, then looks at the scalp, mouth, throat, ears and thyroid as appropriate. Ultrasound can show whether a lump is solid or fluid-filled. Some findings require a needle sample or biopsy for a definite answer.

Do not squeeze, puncture or repeatedly press the lump. Note when you first found it, whether it changes, and any recent sore throat, dental issue, skin infection, fever, vaccination or injury. A photograph beside a ruler can help document change without daily handling.

Book an examination if the cause is unclear, the lump persists after an infection has settled, returns, enlarges, or feels hard and fixed. Mention voice change, ear pain, swallowing difficulty, night sweats or weight loss. Further tests depend on the location and examination rather than appearance alone.

Get emergency help if neck swelling interferes with breathing or swallowing, grows rapidly, or comes with swelling of the tongue or throat. A pulsating lump should not be pressed and needs urgent medical evaluation.

Request prompt assessment for a lump that is red, hot and very painful, particularly with fever, because an abscess may require treatment. Faster review is also appropriate for a hard or fixed mass, progressive enlargement, persistent hoarseness, coughing blood, drenching night sweats or unexplained weight loss.

Ask which structure the lump seems to arise from, whether infection is evident, and whether ultrasound or sampling is needed. Find out how to monitor it, when follow-up should occur, and which changes require contact before that visit.