Epidermoid cysts are one of the most common types of skin cyst, affecting people of all ages and backgrounds. Although they are almost always harmless, they can grow over time, become inflamed or infected, and cause discomfort or self-consciousness, particularly when they appear in visible areas. For many people, professional removal offers the most reliable and lasting solution.

This comprehensive guide explains everything you need to know about epidermoid cysts: what they are, why they form, how to recognise them, when removal is recommended, what the procedure involves, and how to care for your skin afterwards.

What Is an Epidermoid Cyst?

An epidermoid cyst is a small, benign, closed sac that develops just beneath the surface of the skin. It is lined with cells from the epidermis, the outermost layer of skin, and gradually fills with keratin, a thick protein that the skin naturally produces.

Over time, this keratin builds up inside the sac, giving the cyst its characteristic firm, dome-shaped appearance. The contents are typically pale, thick, and cheese-like in texture, often with a distinctive odour.

Epidermoid cysts are frequently referred to as “sebaceous cysts,” but this is technically inaccurate. True sebaceous cysts originate from oil-producing glands and are far less common. Epidermoid cysts, by contrast, arise from skin cells and keratin rather than sebum.

How Common Are Epidermoid Cysts?

Epidermoid cysts are extremely common and are among the most frequently encountered skin lumps. They can appear at any age but are most common in adults, particularly between early adulthood and middle age. They affect both men and women, although they tend to be slightly more common in men.

Some people develop just one cyst in their lifetime, while others are prone to multiple cysts over the years.

Where Do Epidermoid Cysts Appear?

Epidermoid cysts can form almost anywhere on the body, but they most commonly appear on areas with a high concentration of hair follicles and skin glands. Typical locations include the:

Face
Neck
Back
Chest
Shoulders
Scalp
Behind the ears
Genital area

They can range in size from a few millimetres to several centimetres across and often grow very slowly over months or years.

What Causes Epidermoid Cysts?

Epidermoid cysts develop when surface skin cells become trapped beneath the skin instead of being shed normally. These cells continue to produce keratin, which accumulates and forms a cyst. Several factors can contribute to their formation:

Blocked or damaged hair follicles, which is one of the most common triggers
Skin trauma or injury, such as cuts, abrasions, or surgical wounds that push surface cells deeper into the skin
A history of acne, as damaged or clogged follicles are more likely to form cysts
Genetic predisposition, with certain inherited conditions (such as Gardner syndrome) causing multiple cysts
Ruptured oil glands or follicles, which can wall off and trap skin cells

In most cases, epidermoid cysts develop without any obvious cause, and identifying the trigger is rarely necessary. What matters most is whether the cyst is causing problems and whether removal is appropriate.

Recognising the Symptoms

Epidermoid cysts are usually easy to identify by their appearance and feel. Common features include:

A small, round, firm lump just beneath the skin
A smooth, dome-shaped surface
A central dark plug or opening, known as a punctum
Slow, gradual growth over time
A soft, movable feel when gently pressed
Occasional drainage of thick, pale, foul-smelling keratin

In most cases, epidermoid cysts are painless. However, they can become tender, swollen, or inflamed, especially if they rupture or become infected.

Signs of an Infected or Inflamed Cyst

An epidermoid cyst that becomes infected or inflamed requires prompt attention. Warning signs include:

Redness around the lump
Warmth in the affected area
Swelling and tenderness
Pain or throbbing
Pus or unpleasant-smelling discharge
A sudden increase in size

If you notice any of these symptoms, it is important to seek professional advice rather than attempting to squeeze or drain the cyst yourself, which can worsen infection and increase the risk of scarring.

When Should an Epidermoid Cyst Be Removed?

Not every epidermoid cyst needs to be removed. Small, painless cysts that cause no concern can often be left alone and simply monitored. However, removal is frequently recommended when a cyst:

Becomes large, prominent, or cosmetically bothersome
Is located in a visible area such as the face or neck
Causes discomfort, pressure, or irritation
Becomes infected or inflamed repeatedly
Continues to grow over time
Interferes with daily activities, clothing, or shaving
Causes anxiety or affects self-confidence

The most effective way to prevent a cyst from returning is complete surgical removal, including the entire sac wall.

Why You Shouldn’t Try to Remove a Cyst Yourself

It can be tempting to squeeze or pop an epidermoid cyst at home, but this is strongly discouraged. Attempting to do so can:

Push bacteria deeper into the skin, causing infection
Cause the cyst to rupture beneath the surface
Trigger inflammation and scarring
Leave the sac intact, allowing the cyst to refill and return

Only professional removal ensures the entire cyst, including its sac, is taken out safely and cleanly, which is the key to a lasting result.

How Is an Epidermoid Cyst Diagnosed?

Diagnosis usually begins with a thorough clinical examination. In most cases, an experienced practitioner can identify an epidermoid cyst by its appearance and feel alone.

During a consultation, the practitioner will typically:

Examine the size, location, and condition of the cyst
Discuss your symptoms and medical history
Determine whether the cyst is inflamed or infected
Recommend the most suitable treatment approach

In rare cases, further investigation or laboratory analysis of the removed cyst may be advised to confirm the diagnosis and rule out other skin conditions.

The Epidermoid Cyst Removal Procedure

Epidermoid cyst removal is a minor surgical procedure performed under local anaesthetic. It is quick, well-tolerated, and carried out with careful attention to both safety and aesthetic outcome.

A typical procedure follows these steps:

Consultation and assessment. The practitioner examines the cyst, explains the procedure, and answers any questions you may have.
Preparation. The area is cleaned and sterilised to minimise the risk of infection.
Local anaesthetic. A numbing injection ensures the procedure is comfortable and pain-free. You remain fully awake throughout.
Excision. The cyst and its surrounding sac are carefully removed in their entirety. Removing the complete sac wall is essential to prevent recurrence.
Closure. The wound is closed with fine sutures to support neat, healthy healing.
Dressing. A clean dressing is applied, and aftercare instructions are provided.

The entire procedure usually takes around 30 minutes, depending on the size and location of the cyst. Most patients are able to return to their normal day with minimal disruption.

Treatment for Infected Cysts

If an epidermoid cyst is actively infected at the time of consultation, immediate full removal may not be advisable. In these cases, the recommended approach may first involve:

Drainage to relieve pressure and discomfort
A course of antibiotics to clear the infection
A return visit for complete removal once the inflammation has settled

Removing an inflamed cyst can increase the risk of complications and recurrence, so timing the procedure correctly is important for achieving the best outcome.

Aftercare and Recovery

Recovery from epidermoid cyst removal is usually straightforward, and good aftercare plays an important role in achieving a smooth result. General guidance includes:

Keep the area clean and dry for the first 24 to 48 hours
Follow dressing instructions provided by your practitioner
Avoid strenuous activity and heavy lifting for several days
Do not pick or scratch the healing wound
Attend your follow-up appointment if stitches need to be removed
Protect the area from the sun to reduce the visibility of any scar

Mild swelling, bruising, or tenderness is normal and usually settles within one to two weeks. Personalised aftercare advice tailored to your procedure and the location of the cyst will help ensure the best possible healing.

When to Seek Advice After Removal

While complications are rare, you should contact your clinic if you experience:

Increasing redness, swelling, or pain
Discharge or signs of infection
Bleeding that does not settle
A high temperature or feeling generally unwell

Will It Leave a Scar?

Any procedure that involves an incision carries some risk of scarring. The size and visibility of a scar depend on factors such as the cyst’s size, its location, and your individual healing process.

Careful, precise surgical techniques are used to minimise scarring wherever possible. In most cases, scars are small and fade considerably over time. Scar management options and realistic expectations can be discussed during your consultation.

Can Epidermoid Cysts Come Back?

When an epidermoid cyst is removed completely, including the entire sac wall, recurrence is uncommon. However, if any part of the sac is left behind (for example, after squeezing or incomplete drainage), the cyst can refill and return. This is precisely why professional, complete excision offers the most reliable, long-term result.

It is also worth noting that people who are prone to cysts may develop new ones elsewhere on the body, even after the successful removal of an existing cyst.

Frequently Asked Questions

Are epidermoid cysts dangerous? The vast majority are entirely benign and pose no health risk. However, any lump that changes rapidly, becomes painful, or behaves unusually should be assessed by a professional to rule out other conditions.

Is the removal procedure painful? The area is numbed with local anaesthetic, so the procedure itself is comfortable. You may feel slight pressure but should not feel pain. Mild tenderness afterwards is normal.

How long does removal take? Most procedures take around 30 minutes, though this can vary depending on the size and location of the cyst.

Can I go back to work the same day? Many patients return to normal activities the same day, although it is sensible to avoid strenuous activity for a few days.

Do all epidermoid cysts need to be removed? No. Small, painless cysts can often simply be monitored. Removal is recommended when a cyst is bothersome, growing, recurrent, or prone to infection.

What is the difference between an epidermoid cyst and a sebaceous cyst? Although the terms are often used interchangeably, they are different. Epidermoid cysts arise from skin cells and contain keratin, whereas true sebaceous cysts originate from oil glands and are much rarer.