Sebaceous Cyst: Symptoms, Causes, Types, Diagnosis, Treatment & Prevention

What Is a Sebaceous Cyst?

A sebaceous cyst is a non cancerous, slow growing lump that develops under the skin due to blockage of a sebaceous gland or hair follicle. It is filled with a thick, oily substance called keratin.

These cysts can appear anywhere on the body but are most commonly found on the face, neck, scalp, back, and upper torso. They are usually painless but may become swollen, infected, or tender in some cases.

Sebaceous cysts are generally harmless, but they may require treatment if they grow large, become infected, or cause cosmetic concerns.

How Common Is Sebaceous Cyst?

Sebaceous cysts are very common skin conditions.

Some key facts include:

• Can occur in people of all ages
• More common in adults than children
• Frequently seen on oily skin areas
• Often associated with acne prone skin
• May occur due to blocked hair follicles
• Many cases go unnoticed unless they grow larger
• Usually benign and not dangerous

Types of Sebaceous Cyst

1. Epidermoid Cyst

Most common type, formed due to trapped skin cells under the skin.

2. Pilar (Trichilemmal) Cyst

Common on the scalp, arising from hair follicles.

3. True Sebaceous Cyst

Rare type arising directly from sebaceous glands.

4. Inflamed Cyst

Cyst that becomes red, swollen, and painful due to infection.

5. Ruptured Cyst

Occurs when the cyst wall breaks, causing inflammation.

Symptoms of Sebaceous Cyst

Common Symptoms:

• Small, round lump under the skin
• Slow growing mass
• Painless in most cases
• Smooth and movable lump
• May have a small central opening
• White or yellow thick discharge if squeezed

Infected Cyst Symptoms:

• Redness and swelling
• Pain or tenderness
• Warmth over the area
• Pus or foul smelling discharge
• Fever in severe cases

Causes of Sebaceous Cyst

1. Blocked Hair Follicles

Most common cause of cyst formation.

2. Skin Trauma

Injury or irritation can trap skin cells.

3. Excess Sebum Production

Overactive oil glands can contribute.

4. Genetic Factors

Some people are more prone due to family history.

5. Skin Conditions

Acne or other inflammatory skin diseases.

6. Hormonal Changes

Can increase oil production and blockage risk.

Risks of Sebaceous Cyst

Although usually harmless, complications may include:

• Infection and abscess formation
• Pain and swelling
• Rupture causing inflammation
• Recurrence after incomplete removal
• Cosmetic concerns
• Scarring after infection or surgery
• Rare misdiagnosis as other skin tumors

Diagnosis of Sebaceous Cyst

Doctors diagnose sebaceous cysts through:

1. Physical Examination

Assessment of lump size, texture, and location.

2. Ultrasound Scan

Helps confirm cystic nature and rule out other lumps.

3. Dermatoscopy

Detailed skin examination using magnification.

4. Biopsy (Rare)

Done if diagnosis is unclear or malignancy is suspected.

Treatment of Sebaceous Cyst

1. Observation

No treatment needed if:

• Small
• Painless
• Not infected

2. Medical Treatment

For infected cysts:

• Antibiotics
• Anti inflammatory medications
• Warm compresses to reduce swelling

3. Incision and Drainage

• Used for infected or painful cysts
• Relieves pressure but may not prevent recurrence

4. Surgical Removal

Most effective treatment:

• Entire cyst wall is removed
• Prevents recurrence
• Usually done under local anesthesia
• Recommended for recurrent or large cysts

5. Laser Removal

• Minimally invasive option for small cysts.

Prevention of Sebaceous Cyst

Sebaceous cysts cannot always be prevented, but risk can be reduced by:

• Maintaining good skin hygiene
• Regular cleansing of oily skin
• Avoiding squeezing pimples or lumps
• Treating acne early
• Avoiding skin trauma or irritation
• Using non-comedogenic skincare products
• Regular dermatology check-ups if prone to cysts