Finding a lump on your neck, back, or behind your ear can be alarming—especially if it appears suddenly or looks unusual. In many cases, such lumps are completely harmless, but sometimes they can signal an underlying health problem that requires attention.
These lumps can vary greatly in size, density, and cause. Some go away on their own over time, while others persist, grow, or become inflamed. Understanding the possible causes is key to knowing how to care for them and when to seek medical attention.
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In this article, we’ll look at the most common causes of these lumps—with a particular focus on epidermal (epidermoid) cysts. We’ll look at the symptoms, home care options, potential risks, and medical treatments.
What is an epidermoid cyst?
An epidermoid cyst is a common, benign (noncancerous) growth that develops just below the surface of the skin. It usually grows slowly and can appear almost anywhere on the body, but is most common on the neck, back, face, or behind the ears.
These cysts form when skin cells that should normally be shed and shed become “trapped” under the skin. They continue to multiply and form a capsule filled with keratin, a dense protein that is also found in hair and nails.
In most cases, epidermoid cysts are not painful or dangerous. However, if they become inflamed or infected, redness, swelling, and pain may occur.
Causes and risk factors
Epidermoid cysts can occur as a result of:
clogged hair follicles or pores
minor skin injuries or trauma
chronic skin problems, such as acne
certain genetic conditions, including Gardner syndrome
Although anyone can develop such a cyst, they are more common in older people and are seen more often in men than in children.
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Symptoms and diagnosis of lumps
The most common symptom is a small, rounded lump under the skin. Its typical characteristics include:
smooth or slightly hard surface
skin-tone or paler color
lack of pain unless infected
If the cyst becomes infected, you may experience:
redness and warmth at the site
swelling and tenderness
thick discharge with an unpleasant odor
