Understanding Ear-Adjacent Bumps: Causes and What to Expect

Common Causes of a Pea-Sized Lump Near the Ear

1. Enlarged Lymph Node (Reactive Lymphadenopathy)

Most common. Posterior auricular, preauricular, or upper cervical nodes enlarge in response to scalp, ear, or upper respiratory infections (viral, bacterial, fungal). Usually tender, mobile, rubbery. Resolves in 2–4 weeks.

2. Sebaceous (Epidermoid) Cyst

Blocked sebaceous gland → keratin-filled sac. Smooth, mobile, non-tender unless infected (then red, painful, may drain). Central punctum often visible.

3. Lipoma

Benign fatty tumor. Soft, doughy, mobile, non-tender. Grows slowly over years.

4. Parotid Gland Lesion

Pleomorphic adenoma (benign mixed tumor) — firm, mobile, deep to ear lobe. Warthin's tumor, rarely malignancy.

5. Keloid / Hypertrophic Scar

Post-piercing, surgery, or trauma. Firm, raised, extends beyond original wound. More common in darker skin tones.

6. Skin Cancer

• Basal cell carcinoma: pearly, telangiectatic, may ulcerate.
• Squamous cell carcinoma: scaly, crusted, indurated.
• Melanoma: asymmetric, irregular borders, color variation, diameter >6 mm, evolving.

7. Mastoiditis (Rare)

Postauricular swelling, erythema, ear protrusion, fever — complication of acute otitis media. Emergency.

When to See a Doctor

• Lump persists >2–3 weeks
• Grows rapidly, becomes fixed/hard
• Pain, redness, warmth, drainage
• Associated hearing loss, facial weakness, weight loss, night sweats
• History of skin cancer or immunosuppression

Workup

Clinical exam → ultrasound (cyst vs solid vs vascular) → FNA/biopsy if indicated. Most are benign and require only reassurance or simple excision.