This article explains the most common causes of lumps—especially epidermoid cysts—along with symptoms, home care options, potential risks, and medical treatments.
What Is an Epidermoid Cyst?
An epidermoid cyst is a common, benign (non-cancerous) growth that forms just beneath the skin. These cysts are usually slow-growing and can appear almost anywhere on the body, though they are most often found on the neck, back, face, or behind the ears.
They develop when skin cells that normally shed become trapped beneath the skin’s surface. These cells continue to multiply and form a sac filled with keratin, a thick protein also found in hair and nails.
Most epidermoid cysts are painless and harmless. However, they can become inflamed or infected, leading to redness, swelling, and discomfort.
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