Finding a lump on your neck, back, or behind your ear can be unsettling. These lumps differ widely in size, feel, and underlying cause—ranging from harmless cysts to more serious medical issues. Knowing what might be behind a lump is key to deciding what steps to take next. Some lumps disappear on their own, while others need medical evaluation or treatment. This article offers a clear overview of the most common types of lumps, their possible causes, warning signs, and treatment approaches, helping you make informed choices about your health.

An epidermoid cyst is a common type of benign growth that occurs beneath the skin. These cysts are typically slow-growing and can appear anywhere on the body, though they are frequently found on the neck, back, and behind the ears. They are formed when skin cells, instead of shedding, move deeper into the skin and multiply. The cyst is filled with keratin, a protein that is also found in hair and nails. While generally harmless, epidermoid cysts can become inflamed or infected, causing discomfort and requiring medical attention.