Sebaceous and Pilonidal Cysts: Causes, Symptoms, Treatments, Prevention
Sebaceous and pilonidal cysts are common dermatological conditions, but they are often uncomfortable and painful. In this article, we’ll explore these conditions in detail, from their causes and symptoms to when surgical excision becomes necessary. At Elytis, we understand the importance of an accurate diagnosis and effective treatment, and we provide patients with high-quality general surgery services.
About Cysts
Cysts are benign growths, often filled with fluid or other semisolid material, that develop under the skin or within deep structures of the body. Although most are not dangerous, they can become painful, unsightly, or infected, requiring medical treatment.
Two of the most common types of cysts are sebaceous cysts and pilonidal cysts. Although both appear as lumps under the skin, they differ completely in terms of cause, location, and treatment.
Many people confuse these types of cysts, which can lead to delays in diagnosis or ineffective treatments. That is why a clear understanding of each type is essential for knowing when to see a doctor and how to prevent complications.
What are sebaceous cysts?
Sebaceous cysts are small, round growths that develop under the skin, most commonly due to a blockage in the sebaceous glands. These glands produce sebum, an oily substance that moisturizes and protects the skin. When the gland’s duct becomes blocked, sebum accumulates and forms a cyst.
These cysts generally appear on the face, neck, scalp, trunk, or back—areas rich in sebaceous glands. They are usually painless and have a soft or elastic consistency. The skin over them may appear normal or slightly reddish, and a black dot (open pore) may sometimes be visible in the center of the cyst.
Causes include minor trauma (scratches, cuts), acne, excess sebum, skin inflammation, or genetic factors. In some cases, a sebaceous cyst may develop without any obvious cause.
When uninfected, these cysts do not cause pain and can go unnoticed for years. However, when they become infected, they turn red, become tender to the touch, and can grow rapidly in size. In severe cases, an abscess may form that requires drainage.
It is important to know that, although they are benign, these cysts do not go away on their own. Definitive treatment usually involves complete removal through a minor surgical procedure.
For an accurate diagnosis and proper differentiation between the two types of cysts, schedule a dermatology consultation at Elytis Hospital as soon as you notice a lump, before infections and complications develop.
Table: Characteristics of a sebaceous cyst
| Feature | Details |
| Location | Face, neck, torso, back, scalp |
| Contents | Sebum (yellowish-white in appearance, with a distinctive odor) |
| Pain | No, unless it gets infected |
| Common Causes | Blocked sebaceous glands, acne, trauma |
| Treatment | Surgical excision, sometimes drainage in case of infection |
| Risk of recurrence | Low if completely excised |
| Development | It may remain symptom-free for years, or it may suddenly become inflamed |
What are pilonidal cysts?
A pilonidal cyst is a condition specific to the coccygeal region (above the gluteal cleft), where, due to friction, sweating, and the presence of hair, an infected sinus (cavity) can form. This cyst is more common in young men between the ages of 15 and 35, particularly those with excessive body hair and a sedentary lifestyle.
The cyst usually appears as a painful lump at the base of the spine, which may become abscessed, leaving traces of pus or blood on underwear. In many cases, the infection recurs, and the area becomes chronically inflamed, leading to the formation of a “pilonidal sinus.”
Among the main causes are ingrown hairs, excessive sweating, prolonged pressure on the sacrococcygeal region (prolonged sitting), poor hygiene, or genetic predisposition. The small hairs that penetrate the skin trigger an inflammatory response, leading to the formation of a cyst.
These cysts can be acute or chronic. In the acute form, they are characterized by severe pain, swelling, and fever. The chronic form may involve multiple skin openings that become repeatedly infected and suppurate.
If left untreated, pilonidal cysts can develop into large abscesses and fistulas. Although they are not cancerous, their recurrence significantly affects quality of life, and treatment usually involves surgery.
Table: Characteristics of a pilonidal cyst
| Feature | Details |
| Location | The sacrococcygeal region (at the base of the spine, between the buttocks) |
| Contents | Pus, ingrown hair, cellular debris |
| Pain | Yes, it is often severe in the acute phase |
| Common Causes | Friction, ingrown hairs, sitting for long periods, poor hygiene |
| Treatment | Drainage, excision, various surgical procedures |
| Risk of recurrence | Significant, especially if postoperative instructions are not followed |
| Development | It can become chronic, with frequent recurrences |
What are the common symptoms and differences between the two types of cysts?
Both sebaceous cysts and pilonidal cysts initially appear as lumps under the skin. However, there are significant differences in their location, appearance, pain, and progression.
Sebaceous cysts are generally painless and develop slowly. They are round in shape, with skin that is normal in color or slightly yellowish. They can be easily felt and, in some cases, have a visible central point that resembles a pimple. When they become infected, they become painful, turn red, and may ooze a yellowish-white fluid with a distinct sebum odor.
Pilonidal cysts, on the other hand, most often cause pain from the very beginning. They are located strictly in the coccygeal region and can make it difficult to sit, walk, or get dressed. In their acute form, they become inflamed rapidly and can form an abscess that requires emergency drainage. In the chronic form, small openings form in the skin from which pus or blood oozes out repeatedly.
Another important difference is that pilonidal cysts are rarely ignored by patients, due to pain and frequent recurrences. In contrast, a sebaceous cyst may go unnoticed for months or even years.
Correctly identifying the type of cyst is essential, as treatments vary considerably: a sebaceous cyst can be easily removed in the doctor’s office, whereas a pilonidal cyst often requires more complex surgery.
Comparison Table: Sebaceous Cyst vs. Pilonidal Cyst
| Feature | Sebaceous cyst | Pilonidal cyst |
| Location | Face, neck, scalp, back | The coccygeal region (base of the spine) |
| Pain | Rarely, only in cases of infection | Frequent, even severe |
| Appearance of pus | Only if they get infected | Very often, including in its chronic form |
| Risk of recurrence | Low, if it is completely excised | Serious, if not treated properly |
| Standard treatment | Simple excision | Surgery (conventional excision, sinusectomy, etc.) |
| Causes | Blockage of the sebaceous glands | Hair strands, friction, poor hygiene |
What are the possible complications of sebaceous and pilonidal cysts?
Although both types of cysts are essentially benign, if left untreated they can lead to serious complications, especially if they become infected or recur frequently.
For sebaceous cysts, the most common complication is a local infection. This leads to the formation of an abscess that requires drainage. If not treated properly, the infection can spread locally or even systemically (rarely). In addition, a cyst that bursts spontaneously may leave scars or form a new cyst in the same area.
Pilonidal cysts, on the other hand, are much more likely to recur and become chronic. Repeated infections can lead to the formation of fistulas (abnormal channels under the skin), which makes treatment more complex. In some cases, multiple openings may appear in the skin through which pus drains—a painful and bothersome condition.
A rarer but documented complication of chronic pilonidal cysts is malignant transformation —that is, the development of carcinoma in that area after years of inflammation and repeated infections. This is an additional reason for the proper and complete treatment of these cysts.
Chronic infections can also affect a patient’s overall health, reducing their ability to work and their quality of life. For this reason, ignoring symptoms or relying on “folk remedies” is discouraged.
Diagnosis of Sebaceous and Pilonidal Cysts
The diagnosis for both types of cysts is, in most cases, clinical—that is, it is made based on the doctor’s observation and palpation. No sophisticated tests are necessary, except in complicated or atypical cases.
In the case of a sebaceous cyst, the dermatologist will examine the lump, its consistency, the presence of a central point, and any possible inflammation. In rare cases, when the cyst has an unusual appearance, a soft-tissue ultrasound may be recommended to rule out other lesions (lipoma, dermoid cyst, etc.).
For a pilonidal cyst, the surgeon or dermatologist will examine the sacrococcygeal area. They will look for skin openings, signs of inflammation, and fistulas, and will assess the amount of discharge. Sometimes, in complicated cases, a pelvic MRI may be recommended to assess the extent of the sinuses or any fistulas.
It is very important that the patient not squeeze or try to drain the cysts on their own. This not only worsens the infection but can also make diagnosis more difficult.
Once a diagnosis has been made, the doctor will recommend the best course of treatment, taking into account the stage, size, and history of the lesion.
How are sebaceous and pilonidal cysts treated?
The treatment of cysts depends on their type, location, clinical condition, and other individual factors.
Treatment of Sebaceous Cysts
Sebaceous cysts can be treated in several ways, depending on their stage:
- Active observation – if the cyst is small, uninfected, and asymptomatic, the doctor may recommend simply monitoring it, without immediate intervention.
- Antibiotics – if there are signs of infection (redness, pain, localized warmth), oral or topical antibiotics may be prescribed. However, these do not treat the underlying cause, but only the temporary infection.
- Incision and drainage – in the case of an abscess (an infected cyst containing pus), a small incision may be made to drain the contents. The procedure provides rapid pain relief but does not completely remove the cyst.
- Complete surgical excision —this is the only method that can permanently remove a sebaceous cyst. The procedure is minimally invasive, performed under local anesthesia, and takes 20–30 minutes. The recurrence rate is low if the cyst is completely removed.
Treatment of Pilonidal Cysts
Treatment for a pilonidal cyst depends on whether it is acute or chronic and can be more complex:
- Drainage of a pilonidal abscess —in cases of acute inflammation with severe pain and pus, immediate incision and drainage are necessary, under local or general anesthesia. However, this is not a permanent solution.
- Elective surgery (complete excision) – recommended for chronic or recurrent cases. There are several techniques:
- Conventional excision with primary closure (stitches)
- Excision with secondary healing (no closure, natural healing)
- Modern minimally invasive procedures (sinusectomy, the Bascom technique, pit picking)
- Conventional excision with primary closure (stitches)
- Postoperative care —is essential for preventing recurrences. It includes keeping the area clean, regular hair removal, avoiding prolonged sitting, and regular follow-up visits.
Table: Comparison of Treatment Methods
| Cyst type | Temporary treatment | Permanent treatment | Recidivism |
| Sebaceu | Antibiotics, drainage | Complete excision | Rare |
| Pilonidal | Abscess drainage, antibiotics | Surgery (traditional or modern) | Frequently |
How can sebaceous and pilonidal cysts be prevented?
Preventing cysts generally involves maintaining strict hygiene and avoiding risk factors. However, prevention varies slightly depending on the type of cyst.
Prevention of sebaceous cysts:
- Washing your skin daily with gentle, non-comedogenic products
- Avoiding squeezing pimples or acne lesions
- Treatment of pre-existing skin conditions (e.g., acne)
- Preventing Skin Injuries
Prevention of pilonidal cysts:
- Keeping the skin in the sacrococcygeal region dry and clean
- Periodic hair removal (using hair removal cream, laser, etc.)
- Avoid tight clothing that rubs against the area
- Alternating between a sitting position and frequent breaks
- Regular Exercise for Circulation and Immunity
Prevention is most effective in mild cases or after surgical treatment to prevent recurrence. If you have already had a pilonidal cyst, it is crucial to strictly follow hygiene guidelines and medical advice.
Frequently Asked Questions (FAQ)
Here are some of the frequently asked questions about sebaceous or pilonidal cysts and the answers provided by our team of specialists.
Can a sebaceous cyst become cancerous?
Extremely rare. Sebaceous cysts are benign. However, if a cyst rapidly changes shape or color, or becomes painful for no apparent reason, it is advisable to see a doctor.
Can a pilonidal cyst be cured without surgery?
Very unlikely. If it is a mild case, the symptoms may subside temporarily, but the risk of recurrence is high. Surgical treatment is usually necessary for chronic or recurrent cases.
Can I drain a cyst at home?
It is not recommended. Squeezing can worsen the infection, lead to the formation of an abscess, and leave scars. Seeking medical advice is much safer and more effective.
How long does it take to recover from pilonidal cyst surgery?
It depends on the type of procedure. Full recovery can take between 2 and 8 weeks. Minimally invasive techniques significantly reduce recovery time.
How do I know if I have a pilonidal cyst?
If you feel a lump or swelling at the base of your back that is draining pus or blood, it is very likely a pilonidal cyst. See a doctor for confirmation.
The Excision Procedure at Elytis
At Elytis, the removal of sebaceous and pilonidal cysts is performed under conditions that ensure maximum safety and comfort for the patient.
- Medical consultation: an initial evaluation to determine the size and location of the cyst.
- Anesthesia: Local or general anesthesia is administered, depending on the complexity of the procedure.
- Excision: The surgeon makes a small incision and removes the cyst completely.
- Sutures: The incision is closed with sutures, and the area is covered with a sterile dressing.
- Recovery: Patients receive detailed instructions for postoperative care and follow-up appointments.
Why choose Elytis for cyst removal?
- Medical expertise and excellence: Our team of surgeons consists of professionals with extensive experience in general surgery.
- Modern technology: We use state-of-the-art equipment and minimally invasive techniques to achieve optimal results.
- Multidisciplinary approach: We collaborate with various specialties to provide comprehensive and personalized care.
- Postoperative care: We provide close monitoring and support to ensure a quick and safe recovery.
- Comprehensive services: From initial consultations to complex surgical procedures, our patients benefit from a wide range of medical services.
At Elytis Hospital, patient health and comfort are our top priorities. We are committed to providing the highest quality medical care, ensuring lasting and satisfactory results.
Sebaceous and pilonidal cysts can be bothersome conditions, but surgical treatment at Elytis offers an effective and safe solution.
If you're facing these issues, don't hesitate to contact us for a consultation. Our team of professionals is ready to offer you the best solutions for a healthy, worry-free life.
Latest medical review:
August 4, 2025, Dr. Cristian Ene Roată – Chief Physician