A sebaceous cyst (more accurately called an epidermoid cyst) is a slow-growing, harmless lump under the skin filled with keratin (a protein found in skin and hair), not “oil” from sebaceous glands.
They are usually found on the face, neck, back, or torso and often feel like a small, round, movable bump.
What causes sebaceous (epidermoid) cysts?
There is no single cause, but common reasons include:
1. Blocked hair follicles
Dead skin cells get trapped instead of shedding normally.
2. Skin injury or irritation
A scratch, acne, or minor trauma can trap skin cells under the surface.
3. Acne or oily skin conditions
People with acne-prone skin may develop them more often.
4. Genetic tendency
Some people are simply more prone to developing cysts.
5. Hormonal factors
Hormonal changes can increase skin cell turnover and blockage risk.
Symptoms of a sebaceous cyst
- Small, round lump under the skin
- Slow-growing
- Usually painless (unless infected)
- May have a small central black dot (blocked pore)
- Can become red, swollen, or tender if infected
Home “remedy” truth (important)
There is no true home remedy that removes a cyst permanently.
But you can manage mild symptoms:
Safe home care:
- Warm compress (helps drainage and comfort)
- Keep area clean
- Avoid squeezing or popping
- Use mild antiseptic if irritated
What NOT to do:
- Do not squeeze or poke it (can cause infection or scarring)
- Do not try “pastes,” acids, or herbal mixtures
Medical treatment options
If the cyst is large, painful, or recurring:
- Small surgical removal (minor procedure)
- Drainage if infected (temporary relief)
- Antibiotics if infection is present
Doctors may remove the cyst wall completely to prevent it from coming back.
When to see a doctor
Seek medical advice if:
- It grows quickly
- Becomes painful or red
- Starts leaking pus or blood
- Reappears repeatedly
- Is located in a sensitive area
