What is an Epidermal Cyst?

An Epidermal Cyst (commonly called a sebaceous cyst) is believed to form when skin injury or acne causes follicular epithelial cells to proliferate, creating a "sac" under the skin. Sebum and keratin secreted by these cells accumulate in the sac, forming a raised lump—essentially a pocket of skin debris.

> Important: Simply squeezing out the contents cannot cure the cyst. As long as the sac remains, sebum and keratin will continue to accumulate, causing recurrence.

Epidermal cyst surgery and lipoma surgery are the most common procedures at Li-Shi Dermatology Clinic.

Why Do Epidermal Cysts Form?

The exact cause of epidermoid cysts is not yet fully understood. It is generally believed to be related to individual constitution. Skin injury may trigger follicular proliferation, creating a "sac" where dead skin cells gradually accumulate over time, inflating like a balloon and causing the skin to bulge.

Risk Factors

High-Risk Groups & Common Locations

• Age: More common in younger people

• Gender: Higher proportion in males

• Common Sites: Upper chest, upper back, neck, scalp, behind ears, groin area in women

Symptoms of Epidermal Cysts

The main difference between epidermoid cysts and blackheads/pimples is that cysts have a "sac" that encapsulates sebum and keratin metabolic products, slowly accumulating to form a cyst.

Main Symptoms

Different Types of Cysts

Some cysts have an opening, while others don't:

• Cysts with Opening: Exposed sebum and keratin oxidize, forming a blackhead-like appearance

• When Squeezed: Toothpaste-like mixture of sebum and keratin may come out, sometimes with a foul odor

> ⚠️ Warning: Do not squeeze cysts yourself or have beauticians do it—this increases the risk of infection and inflammation.

Epidermal Cyst vs Lipoma vs Acne

While all are common skin conditions, their causes and treatments differ:

When is Surgery Needed?

Observation May Be Appropriate When:

• No infection

• Small size

• Not visually obvious

Surgery is Recommended When:

> If already red, swollen, and inflamed with signs of infection, oral or topical medications should be used under doctor's guidance first. Surgery can proceed after inflammation subsides.

Minimally Invasive Cyst Surgery

The most effective way to permanently eliminate an epidermoid cyst is surgical removal with complete sac extraction.

Surgical Steps

Surgery Characteristics

• Duration: Usually completed within one hour

• Hospitalization: Not required; patients go home the same day

• Cyst Size: Can range from a few millimeters to 7-8 centimeters in diameter

Li-Shi Minimally Invasive Advantages

Frequently Asked Questions

Q: Which doctor should I see for an epidermal cyst?

A: You can see a dermatologist, who will first confirm whether it's a skin tumor. If confirmed as an epidermoid cyst, the doctor will decide based on the situation:

• If inflamed → Treat inflammation first

• If not inflamed and not affecting daily life → Can be observed

If you have time constraints or want to minimize post-operative scarring, consider visiting a plastic surgery clinic for removal by a board-certified plastic surgeon.

Q: Will cyst surgery leave a scar?

A: Since skin surgery involves cutting the skin, there will be at least a faint mark.

Noticeable scarring may occur in these situations:

• Very large cyst or unusual location

• Poor post-operative care leading to severe infection

• Patient has keloid-prone constitution

Q: Will the cyst recur?

A: If the cyst sac is completely removed, recurrence is extremely rare. However, a small number of people may experience recurrence due to constitutional factors or incomplete sac removal.

> Don't worry too much—recurrent cysts are mostly benign and can be surgically treated again.

Q: Can lasers treat epidermal cysts?

A: Laser treatment can only create a hole in the cyst to help drainage and reduce size. To achieve permanent results without recurrence, surgical removal of the entire sac is necessary.

Q: How can I prevent epidermal cysts?

A: The exact cause of epidermoid cysts is not fully understood, so there's no definitive prevention method. However, these habits may help:

Q: Will an epidermal cyst disappear on its own?

A: Epidermal cysts generally do not disappear on their own.

• When inflamed: May enlarge

• When not inflamed: Will stay in place and not resolve spontaneously

Post-Operative Care Instructions

After cyst surgery, please follow these care guidelines:

Medication & Wound Care

Normal Occurrences

• Watery discharge from the wound is normal

• Clean with saline solution, pat dry with cotton swab, then apply ointment

Warning Signs Requiring Follow-up

Recovery Time

> Please follow your doctor's instructions for scheduled follow-up appointments.

Conclusion

Epidermal cysts are common benign skin tumors. While they usually don't cause discomfort, you should seek medical evaluation if you experience:

Cosmetic Concerns: Affecting appearance or confidence

Recurrent Inflammation: Frequent redness, swelling, and pain

Continuous Growth: Worry about larger surgical wounds

Inconvenient Location: Causing daily life difficulties

Remember: Complete sac removal is the only way to cure an epidermoid cyst. If you have any questions, please schedule a consultation!