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A usually noncancerous growth filled with liquid or a semisolid substance, sometimes causing pain.

If the cyst is on the skin, apply a warm compress for up to 15 minutes 3 to 4 times a day until the cyst drains. Don't try to pop a cyst due to infection risk.

See a healthcare professional right away for:

• Bad pain.
• Fever, redness or warmth.

Make an appointment to see a healthcare professional if:

• Painful.
• New, unusual, or enlarging growth.