Educational information, not medical advice. This article is written to help you understand common ear and hearing issues. It is not a substitute for professional diagnosis or treatment. If your symptoms are severe, sudden, or persistent, please consult a qualified doctor or audiologist. For urgent symptoms — sudden hearing loss, bleeding from the ear, severe pain with dizziness, or a head injury — seek medical care the same day.
Most lumps behind the ear are harmless swollen lymph nodes or cysts. Here's how to tell the difference, plus the red flags that warrant a same-week appointment.
Quick answer
A lump behind the ear is most often a swollen lymph node (tender, mobile, settles in 2–4 weeks), a sebaceous or epidermoid cyst (smooth, painless), or a lipoma. Less commonly it can be mastoiditis — a hard, painful lump on the mastoid bone that follows a middle-ear infection and needs same-day care. See a doctor within a week if the lump is hard and fixed, larger than 2 cm, present more than 4 weeks, or paired with weight loss, night sweats or ear discharge.
Key takeaways
- Most lumps behind the ear are benign lymph nodes or cysts.
- Mastoiditis is rare but urgent — hard, painful lump with fever and ear infection.
- Red flags: hard/fixed, >2 cm, >4 weeks, or systemic symptoms.
- Never squeeze or lance a lump at home — infection risk.
- Blood from the ear should always be reviewed the same day.
A lump behind the ear is a very common finding and, in the large majority of cases, benign. Understanding the likely causes helps you decide whether to watch, self-treat, or book a doctor's visit.
The most common causes
Swollen lymph node
Soft, mobile, tender, appears during or after a cold, ear infection or scalp issue. Usually settles within 2–4 weeks.
Sebaceous or epidermoid cyst
A smooth, round, painless lump under the skin. Slow-growing and harmless, but can be removed by a dermatologist if it bothers you.
Lipoma
A soft, rubbery, fatty lump. Painless and non-cancerous.
Mastoiditis
A hard, painful lump directly behind the ear on the mastoid bone, often with fever, ear discharge and hearing loss. This is a serious complication of a middle-ear infection and needs same-day medical care.
Skin infection or abscess
Red, hot, tender, sometimes with pus. Usually needs antibiotics.
Red flags — see a doctor within a week
- Hard, fixed lump that does not move under the skin
- Lump larger than 2 cm or growing week on week
- Present for more than 4 weeks with no change
- Associated with unexplained weight loss, night sweats or persistent fever
- Bleeding from the ear or clear fluid discharge
- Sudden hearing loss on the same side
Blood from the ear — always take it seriously
Bleeding can come from a scratched canal, a ruptured eardrum, a middle-ear infection or, rarely, a head injury. Do not put drops in, do not push cotton in — see a doctor the same day.
What we do in the clinic
At Prudent Hearing we examine the ear canal and eardrum with a video otoscope, check hearing with a quick audiogram, and refer you to a trusted ENT partner if imaging or surgical review is needed.
Frequently asked questions
What causes a hard lump behind the ear?
The most common causes are a swollen lymph node (tender, mobile, usually settles in 2–4 weeks), a sebaceous or epidermoid cyst (smooth, painless), a lipoma (soft, rubbery, fatty lump), or, less commonly, mastoiditis — a hard, painful lump on the mastoid bone that follows a middle-ear infection and needs same-day care.
When should I worry about a lump behind my ear?
See a doctor within a week if the lump is hard and fixed, larger than 2 cm or growing, present more than 4 weeks unchanged, or paired with unexplained weight loss, night sweats, fever, ear discharge, bleeding from the ear or sudden hearing loss on the same side.
What does pain behind the ear usually mean?
Pain behind the ear is most often caused by a swollen lymph node, an ear or throat infection, a boil in the skin, TMJ (jaw joint) dysfunction, or referred pain from the neck. Persistent pain with fever, redness or hearing loss should be assessed to rule out mastoiditis.
Is blood coming from the ear an emergency?
Blood from the ear should always be taken seriously. Causes range from a scratched canal or ruptured eardrum to middle-ear infection or, rarely, head injury. Do not insert cotton buds or drops — see a doctor the same day.
Sources & further reading
We cross-checked this article against the following authoritative sources. Guidance and figures reflect the most recent public guidance available at the time of last review (July 2026). Clinical review by the Prudent Hearing clinical team.
- Earache — NHS UK
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