Sebaceous Cyst
Main Cause
A sebaceous cyst usually forms when a skin pore or hair follicle becomes blocked, causing keratin (a protein from skin cells) to build up under the skin. It may also occur after skin injury or irritation.
Common Symptoms
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Round, smooth lump under the skin
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Usually slow-growing
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May be painless
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Sometimes has a small opening or dark spot
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If infected: redness, swelling, warmth, pain, or pus
Home Care
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Warm compress: Apply a clean, warm (not hot) cloth for 10–15 minutes, 3–4 times daily. This may reduce discomfort and encourage natural drainage.
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Keep it clean: Gently wash the area with mild soap and water.
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Do not squeeze or puncture it: This can cause infection and make inflammation worse.
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Avoid harsh remedies: Don’t apply garlic, vinegar, toothpaste, or other irritating substances.
Medical Treatment
If the cyst is large, painful, infected, or keeps coming back, a doctor may:
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Drain the cyst
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Treat infection if appropriate
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Remove the entire cyst and its capsule, which reduces the chance of it returning
When to See a Doctor
Seek medical care if it becomes very painful, rapidly enlarges, red/hot, starts draining pus, or you develop fever. Also have any new or uncertain lump examined rather than assuming it is a cyst.
