Have you ever noticed a small, round lump beneath your skin that seems to appear out of nowhere? Perhaps it is on your face, neck, back, or scalp. It may feel firm or soft, move slightly when touched, or occasionally release a thick substance with an unpleasant smell.
One possible explanation is a skin cyst.
These lumps are often called sebaceous cysts, and although they are usually harmless, they can sometimes become swollen, irritated, or infected. Knowing what causes them and how to care for the affected area can help you avoid unnecessary irritation and recognize when medical treatment may be needed.
The good news is that many uncomplicated cysts do not require immediate treatment. However, home remedies generally cannot remove the cyst itself, and some popular methods may make the problem worse.
In this article, we explain what sebaceous cysts are, why they develop, which home-care methods may help, and when you should consult a healthcare professional.
What Is a Sebaceous Cyst?
A sebaceous cyst is a term commonly used to describe a small lump beneath the skin. In many cases, the lump is actually an epidermoid cyst, which forms when skin cells become trapped beneath the surface and produce keratin, a protein found in skin, hair, and nails.
Another type, called a pilar cyst, commonly develops on the scalp and originates from structures associated with hair follicles.
True sebaceous cysts are less common than many people realize. The distinction matters because different types of cysts may require different approaches to diagnosis and treatment.
These cysts often appear as rounded lumps that grow slowly. Some have a small opening or dark spot in the center, and others contain thick, whitish or yellowish material.
Common locations include:
- The face and neck.
- The scalp.
- The back and shoulders.
- The chest.
- Other areas where hair follicles are present.
Most uncomplicated epidermoid cysts are benign. Nevertheless, a new or unexplained lump should not automatically be assumed to be a cyst without an appropriate assessment.
What Causes Sebaceous Cysts?
Several factors can contribute to the development of skin cysts. The exact cause depends on the type of cyst.
1. Blocked or Damaged Hair Follicles
Epidermoid cysts can develop when cells that normally line the surface of the skin become trapped beneath it.
This may happen following minor skin injuries, inflammation, or damage to a hair follicle.
The trapped cells continue producing keratin, which gradually accumulates inside a small sac and causes a lump to form.
Contrary to a common misconception, these cysts are not necessarily caused by poor hygiene.
2. Skin Injuries
Minor cuts, scratches, or other injuries can sometimes contribute to the formation of an epidermoid cyst.
When surface skin cells become trapped beneath the skin during healing, they may continue to grow and produce keratin.
However, not every cyst develops following an injury, and many appear without an obvious trigger.
3. Genetic Factors
Some people are more likely to develop certain types of cysts because of inherited characteristics.
For example, multiple pilar cysts can run in families. Certain uncommon genetic conditions are also associated with multiple epidermoid cysts.
If you repeatedly develop similar lumps or have several cysts in different areas, a healthcare professional can help determine whether an underlying condition may be involved.
4. Inflammation and Skin Conditions
Inflammatory skin conditions and damage around hair follicles may contribute to cyst formation in some people.
However, ordinary oily skin does not automatically cause epidermoid cysts. These cysts develop through a different process from typical acne pimples.
Understanding this difference can help prevent ineffective treatments, such as repeatedly applying acne products to a cyst.
How Can You Recognize a Sebaceous Cyst?
Skin cysts can vary in size, texture, and appearance. Common features include:
- A round lump just beneath the skin.
- Slow growth over weeks, months, or sometimes years.
- A firm or slightly soft texture.
- A lump that may move slightly under the skin.
- A small central opening in some cases.
- Little or no pain when the cyst is not inflamed.
Some cysts remain small for years, while others gradually increase in size.
If a cyst becomes inflamed or infected, the surrounding skin may turn red, warm, swollen, or tender. The cyst may also release thick material.
However, not every lump with these features is a cyst. Boils, abscesses, swollen lymph nodes, and other skin growths can sometimes look similar.
Seek medical advice if you are uncertain about a lump, particularly if it is growing, persistent, painful, or changing in appearance.
Home Remedy Solutions for Sebaceous Cysts
Although home care cannot reliably eliminate an established cyst, a few simple measures may help relieve discomfort and reduce irritation.