Swelling Near the Ear: Causes and How to Tell Them Apart

The parotid gland sits just below and in front of the ear, and it is the reason so many different problems produce swelling in the same spot. Mumps is the best-known cause, but bacterial infection, a blocked salivary duct, an enlarged lymph node and a tumor all appear there — and they separate cleanly on four questions: one side or both, painful or not, does it flare when you eat, and is there pus.

The main causes, and their signatures

• Viral parotitis, including mumps. Often bilateral, mild to moderately painful, no pus, with systemic symptoms — fever, headache, fatigue. Mumps is the most common cause of childhood parotitis. HIV, Epstein-Barr virus, influenza and coxsackievirus do the same thing.
• Acute bacterial parotitis. Unilateral, progressively painful, with redness over the gland and purulent discharge from the Stensen duct in about 50% of cases. Dehydration and poor oral hygiene are the usual setup.
• Sialolithiasis, a salivary stone. Intermittent, painful swelling triggered by eating. Stones account for nearly 50% of benign salivary gland disorders; about 80% form in the submandibular glands and 6% to 20% in the parotid.
• Swollen lymph node. A discrete, movable lump rather than a diffuse gland, usually reacting to a nearby infection — an ear infection, a throat infection, a scalp problem, an abscessed tooth.
• Juvenile recurrent parotitis. Repeated painful episodes in one or both parotids in a child, with no infection to explain each one.
• Sialosis. Chronic, painless, bilateral parotid enlargement linked to diabetes, alcohol use disorder, liver disease or bulimia.
• Sjögren disease. Chronic or intermittent gland enlargement, largely painless, alongside dry mouth and dry eyes.
• Tumor. Painless, firm, one-sided. Salivary gland tumors are 6% to 8% of head and neck tumors, and 80% to 85% of them occur in the parotid. Facial nerve weakness alongside a mass is the finding that most raises concern.

Sorting it in four questions

Question	If yes	Points to
Both sides?	Yes	Viral, sialosis, Sjögren
Painful and red?	Yes	Bacterial, or an inflamed stone
Worse when eating?	Yes	Duct obstruction
Pus at the duct opening?	Yes	Bacterial parotitis
Firm, painless, one side?	Yes	Tumor — needs imaging

A normal parotid is soft, smooth, non-tender and generally not palpable, and gentle compression produces clear saliva. Anything that changes those four properties is worth an exam.

When it is mumps

Mumps swelling appears between the earlobe and the angle of the jaw, follows a prodrome of fever and headache by a few days, and usually subsides within a week. It is bilateral more often than not, and it comes with feeling generally ill rather than with local pus. The full timeline and incubation window are in mumps symptoms, and the age-specific complications in mumps in adults symptoms.

What to do, and what not to wait on

See a clinician for any swelling that lasts more than a couple of weeks, keeps growing, is hard, irregular or fixed in place, or comes with fever, night sweats or unexplained weight loss. MedlinePlus adds a pediatric threshold: any node in a child larger than 1 centimeter (0.4 inch) should be evaluated. Go immediately for difficulty breathing or swallowing, swelling spreading fast across the face or neck, or facial weakness with a mass.

This content is informational and does not replace medical consultation, diagnosis, or treatment. See also mumps in children symptoms.