What causes a lump behind the ear?

Generally, lumps behind the ear may be caused by excessive sebum secretion, local irritation, folliculitis, sebaceous cysts, or seborrheic keratosis. If discomfort occurs, it is recommended to seek medical attention promptly. Specific analyses are as follows:

1. Excessive Sebum Secretion

The area around the ears contains abundant sebaceous glands. When sebum production is excessive and drainage is blocked, it can accumulate locally and form lumps. These usually do not come with other symptoms; maintaining local cleanliness is advised.

2. Local Irritation

Prolonged use of headphones, headbands, or frequent touching may irritate the skin, leading to the formation of lumps. It is recommended to minimize unnecessary irritation and keep the area dry and well-ventilated.

3. Folliculitis

Folliculitis is an inflammation of hair follicles caused by bacterial infection. When the follicles behind the ear become infected, localized lumps may form, possibly accompanied by redness, swelling, and pain. Treatment under a doctor's guidance may include topical medications such as mupirocin ointment, fusidic acid cream, or compound polymyxin B ointment.

4. Sebaceous Cyst

A sebaceous cyst may form when sebum cannot be properly expelled and accumulates beneath the skin. Warm compresses may help promote spontaneous resolution.

5. Seborrheic Keratosis

Seborrheic keratosis is a common benign skin condition characterized by rough, scaly patches or lumps on the skin surface, which may also appear behind the ears. Under medical supervision, medications such as Xuefu Zhuyu Capsules, Huayu Quban Capsules, or adapalene gel may be used to alleviate symptoms.

If symptoms persist or worsen, prompt treatment at a reputable hospital is recommended to prevent further progression. In daily life, maintaining a light diet and avoiding spicy or irritating foods—such as Sichuan pepper, chili peppers, and onions—is beneficial for recovery.