What a Lump on the Neck, Back, or Behind the Ear May Indicate
One frequent cause of small, slow-growing lumps beneath the skin is an epidermoid cyst. These are non-cancerous growths that develop when skin cells move deeper into the skin instead of shedding normally. Over time, these trapped cells form a sac filled with keratin, a natural protein found in hair and nails. Epidermoid cysts commonly appear on the neck, upper back, or behind the ears and usually feel firm or rubbery to the touch. In most cases, they are painless and harmless, though irritation or infection can make them swollen, red, or uncomfortable.
Certain factors may increase the likelihood of developing cysts or similar lumps. Blocked hair follicles, minor skin injuries, acne-prone skin, or chronic irritation can all play a role. Adults tend to experience these growths more often than children, and they may occur more frequently in men. A healthcare provider can often identify the nature of a lump through a simple physical exam. If there is uncertainty, imaging tests or additional evaluation may be recommended to better understand its structure and rule out other conditions. Monitoring changes in size, color, or sensation is important, as these details help guide next steps.
