Sebaceous cysts
An epidermal inclusion cyst, also known as a sebaceous cyst, is a benign lump under the skin filled with a keratin substance. These cysts typically do not cause symptoms and are usually painless. It is important not to attempt to pop or remove an epidermal inclusion cyst on your own. Instead, seeking the assistance of a healthcare provider is advisable. They can offer proper treatment, which may involve removing the cyst if it causes discomfort or for cosmetic reasons. Professional care ensures the cyst is safely and effectively managed.
An epidermal inclusion cyst, also known as an epidermoid cyst, is a fluid-filled pocket that develops beneath the surface of the skin, appearing as a noticeable lump or bump. Despite being commonly referred to as “sebaceous cysts,” this term is misleading because the cysts are not filled with sebum, the oily substance produced by sebaceous glands that moisturises the skin. Instead, epidermal inclusion cysts contain a mixture of keratin (a protein found in hair, skin, and nails) and cellular debris.
Epidermal inclusion cysts form beneath the top layer of the skin, known as the epidermis, hence their name. They can vary in size and may remain stable or grow slowly over time. While often benign and asymptomatic, they may require medical attention if they become inflamed, infected, or cause discomfort.
- It appears as a round bump or dome-shaped lump on the skin.
- There may be a dark dot (punctum) in the center of the cyst.
- Sizes can vary from small (0.25 inches) to larger than 2 inches, and they tend to grow slowly over time.
- The color of the skin over the cyst is usually pink to red or darker than the surrounding skin.
- It may be tender or warm to the touch.
- The cyst can move easily when touched or pressed.
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