What could it be if a hard lump appears under the ear that is neither painful nor itchy?

Generally, a hard lump appearing under the ear that is painless and non-itchy may be caused by sebaceous gland blockage, reactive lymph node hyperplasia, sebaceous cysts, lipomas, or pleomorphic adenomas of the parotid gland. If discomfort occurs, it is recommended to seek timely medical evaluation and treatment at a reputable hospital. Specific analyses are as follows:

1. Sebaceous gland blockage: Overactive sebaceous glands under the ear can lead to poor discharge and accumulation of sebum, forming a hard lump without obvious discomfort. Maintain local cleanliness, gently wipe with warm water, reduce intake of greasy foods, and avoid frequent pressing or irritation.

2. Reactive lymph node hyperplasia: Mild inflammation in the head or face may stimulate the lymph nodes under the ear, causing them to swell and harden; they typically return to normal after the inflammation resolves. Check for oral or throat infections and treat them promptly, ensure adequate rest, and drink plenty of warm water to promote metabolism.

3. Sebaceous cyst: A retention cyst forms when the sebaceous gland duct becomes blocked. It has a relatively firm texture and usually causes no pain or itching before secondary infection occurs. Topical antibiotics such as fusidic acid cream, mupirocin ointment, or clindamycin gel may be used under medical guidance to prevent infection. Definitive treatment requires surgical excision of the sebaceous cyst.

4. Lipoma: A benign tumor formed by abnormal proliferation of fat tissue, typically soft but slightly firm, with good mobility. Small lipomas require no special treatment and only need regular observation. If the lipoma grows and affects appearance, medications such as Lipoma Dissolving Tablets, Prunella Vulgaris Capsules, or Xiao Jin Pills may be taken under a doctor's supervision. Surgical removal may be necessary when indicated.

5. Pleomorphic adenoma of the parotid gland: A benign tumor originating from the parotid gland tissue, characterized by a hard texture and slow growth. Early surgical removal of the pleomorphic adenoma is recommended. Postoperatively, follow medical advice to take cefradine capsules, amoxicillin-clavulanate potassium tablets, or roxithromycin capsules to prevent infection, and schedule regular follow-up visits.

In daily life, maintain cleanliness of the skin under the ear and avoid squeezing lumps; maintain regular sleep patterns to enhance immunity; seek medical attention promptly if the lump increases in size or becomes painful; and undergo regular health checkups of the head and face for early detection and intervention.