What should you know about a fat lump on the back of the neck?

A soft, movable lump beneath the skin may be a lipoma, which is a collection of mature fat cells. Other possibilities include a cyst, an enlarged lymph node, a muscle or skin lesion, or a deeper mass. A fatty feel cannot confirm the diagnosis, and a neck lump can occasionally be a presentation of lymphoma, thyroid cancer, or head and neck cancer.

The clinician will consider size, depth, tenderness, mobility, skin changes, and growth. Imaging can show whether the lump is superficial or connected to deeper structures. A biopsy or removal may be recommended when the diagnosis is uncertain or the features are concerning.

Arrange an appointment if the lump is new, enlarging, persistent, or troublesome. Note its approximate size, when it appeared, and whether it changes with movement or causes pressure. Mention fever, night sweats, weight loss, voice change, swallowing difficulty, or other new lumps.

Do not puncture or squeeze it. Bring prior scan or biopsy reports and a medicine list. If removal is advised, ask whether the tissue will be sent for laboratory examination and what scar or recovery to expect. Thyroid-related findings may lead to discussion of thyroid removal surgery, but only after assessment.

Seek urgent help for difficulty breathing or swallowing, sudden severe swelling, heavy bleeding, or rapidly spreading redness. Contact your clinician promptly if the lump becomes hard, fixed, painful, ulcerated, or rapidly larger, or if it occurs with persistent fever, drenching night sweats, or unexplained weight loss.

Ask whether the lump feels superficial or deep, whether imaging or biopsy is needed, and which changes should prompt faster review. Ask how the examination separates a fatty growth from a lymph-node or thyroid problem and when results will be discussed.