Discovering a lump under your skin can be concerning, especially if it seems to appear suddenly or gradually grows over time. One common cause of these bumps is a sebaceous cyst, also known as an epidermoid cyst. Fortunately, most of these cysts are harmless and do not pose a serious health risk.
Understanding what causes sebaceous cysts, how to recognize them, and the safest ways to care for them at home can help you make informed decisions about your skin health.
What Is a Sebaceous Cyst?
A sebaceous cyst is a slow-growing lump that develops beneath the skin. These cysts are usually filled with keratin, oils, and dead skin cells.
They commonly appear on:
- Face
- Neck
- Scalp
- Back
- Chest
- Shoulders
In most cases, sebaceous cysts are noncancerous and may remain the same size for months or even years.
What Causes Sebaceous Cysts?
Sebaceous cysts can develop when a hair follicle or oil gland becomes blocked or damaged.
Common causes include:
- Minor skin injuries
- Acne or other skin conditions
- Damaged hair follicles
- Surgery or trauma to the skin
- Genetic factors in rare cases
Sometimes, there is no obvious reason why a cyst develops.
