Sebaceous cysts are among the most commonly misidentified and mismanaged skin lesions we see in outpatient dermatology. Patients arrive having squeezed, needled, or applied heat to a lump that has been there for months — often making things significantly worse. Understanding what these lesions are and how they behave is the starting point for managing them correctly.
What a Sebaceous Cyst Actually Is
The term “sebaceous cyst” is technically a misnomer — most cysts labelled as such are actually epidermal inclusion cysts (also called epidermoid cysts), formed from a pocket of epidermis that has become enclosed beneath the skin surface and continues to produce keratin (not sebum). The cyst wall is formed from epidermal cells, and the contents are a soft, cheesy, malodorous keratin material — not pus. True sebaceous cysts (trichilemmal cysts) are less common and arise from hair follicle structures. The distinction matters for surgical management but is academic in most clinical settings.
Why Squeezing Is the Wrong Answer
Attempting to express the contents of an epidermoid cyst by squeezing or needling it almost always results in one of two outcomes: incomplete drainage (because the cyst wall remains intact and will refill) or rupture of the cyst wall into the surrounding tissue, triggering an intense inflammatory reaction — the classic acutely inflamed, red, painful cyst that patients mistake for infection but is actually a foreign body response to the keratin contents. A ruptured, inflamed cyst is significantly harder to remove cleanly than an intact one, and carries a higher risk of scarring.
When to Remove and How
Small, asymptomatic cysts that are not inflamed and not cosmetically bothersome can be observed. Cysts that are large, recurring, symptomatic, or cosmetically concerning are best removed surgically — complete excision of the cyst with its intact wall under local anaesthesia. Incomplete removal (punch excision without removing the entire cyst wall) has a high recurrence rate. Inflamed cysts are not removed acutely — the inflammation is first managed with intralesional corticosteroid injection or, if infected, a short course of antibiotics, and the cyst is excised once it has settled.
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— Dr. Nishita Ranka | Consultant Dermatologist | Dr. Nishita’s Clinic for Skin, Hair & Aesthetics, Hyderabad
