Epidermoid cyst.
Care, risks
and when to remove.

It is a common lay term. In most cases it refers to an epidermoid cyst, lined by epidermal-type cells and filled with keratin. It is not simply a pocket of sebum. ^[1]

It is usually a round lump under the skin that grows slowly and may be mobile, sometimes with a central punctum. It can become red, warm and painful when inflamed. ^[2]

No. It does not spread from person to person. Secondary bacteria in an inflamed lesion do not make the cyst a routine contagious disease.

No. Squeezing can rupture the wall, spread keratin into the surrounding tissue and increase inflammation, infection and scarring. ^[8]

A small, symptom-free cyst with a secure diagnosis may be observed. Removal can be considered for pain, repeated inflammation, growth, friction, drainage, limitation or cosmetic concern. ^[8]

Drainage may relieve pressure in an inflamed lesion but usually leaves the wall behind. Complete removal of the capsule, when safe, is the definitive approach for reducing recurrence. ^[11]

No. Redness and pain may be inflammation from keratin without bacterial infection. The American Academy of Dermatology advises against routine antibiotics for inflamed epidermal cysts; the decision depends on examination and systemic signs. ^[7]

Not always. A typical lesion may be diagnosed clinically. Ultrasound helps when it is deep, large, recurrent, painful or atypical. ^[1]

Malignant transformation is rare. Rapid growth, firmness, fixation, bleeding or persistent change should still be assessed rather than assumed to be a cyst. ^[11]

A lipoma is a usually soft fatty mass without a skin opening. An epidermoid cyst is an epithelial-lined sac and may have a punctum. There is overlap, so examination matters. ^[11]

Small superficial cysts are often treated under local anaesthesia. The plan depends on site, size, inflammation and scarring risk. ^[8]

Often the team waits until inflammation settles because the tissue planes are easier to separate. In selected cases, one-stage treatment can be discussed. ^[6]

Randomised studies found shorter wounds and operative times with punch or minimal excision in selected 1–2 cm cysts. Results depend on the site, capsule and clinician; there is no guarantee of an invisible scar. ^[3]

The team may send it for histopathology, especially when the appearance is atypical, recurrent, large or uncertain. ^[11]

Yes, particularly if part of the capsule remains. Complete removal lowers the risk, but no procedure makes it zero. ^[11]

A comfortably warm compress may ease discomfort, but it should not burn and does not replace an assessment. Do not open the lesion.

Wash your hands, follow the dressing instructions, keep the wound clean and protected and avoid swimming until cleared. Increasing pain, heat, pus, fever or wound separation needs review. ^[9]

Yes. Facial structures are delicate and scars may be more visible. Do not manipulate it; arrange an assessment to choose timing and technique.

It may be a pilar cyst, which also arises from follicular structures. Examination and, when removed, histopathology clarify the type. ^[11]

Seek prompt care for fever, feeling unwell, spreading redness, severe pain, swelling around the eye, difficulty swallowing or breathing, or rapid enlargement. ^[12]

Not necessarily. Keratin may have a strong smell. Odour alone does not determine antibiotic use; worsening pain, warmth, extensive redness, fever and examination guide the decision. ^[11]

Do not force material out. Protect it with a clean dressing and seek assessment, especially for pain, persistent drainage or redness. A smaller lump does not prove the wall has disappeared. ^[12]

No. Studies of small facial cysts compare scarring and recurrence in selected groups. Having a technology available does not make it the best option for every cyst. ^[4]

Inflammation and rupture can make the wall harder to separate. Settling the episode before planned removal may help. The decision depends on examination. ^[6]

Bring the onset date, previous inflammatory episodes, treatments, medicines and allergies. Mention previous removal and bring the pathology report if available.

This needs arranging. Assessment, consent, equipment and availability may require another appointment. Ask in advance to plan your schedule.

Ask where the incision will be, whether stitches are needed, when they come out and how your previous healing changes the plan. Show any troublesome old scars.

Not on your own. Clean wounds often do not need topical antibiotics, which may cause allergy. Follow the product and dressing instructions for your procedure. ^[7]

It may be a new cyst, recurrence or something different. Location, appearance and evolution need reassessment; do not reuse an old prescription for a new episode. ^[11]

Confirm that the lump fits a cyst and distinguish a stable lesion from inflammation or infection. This determines the timing and purpose of treatment. ^[7]

It may stay stable, but it can also grow, cause discomfort, become inflamed or become infected. Monitoring may be appropriate without symptoms; changes or repeated flares need reassessment. These outcomes are not inevitable.[8] [11]

Drainage empties the contents and may relieve a flare, but it does not necessarily remove the entire capsule. A remaining capsule can allow recurrence. Assessment determines when to treat inflammation and when to consider complete removal.[13]