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A skin cyst is a closed sac under the skin that can be filled with fluid, pus, or other material. They are generally harmless and can vary in size. While they can occur anywhere on the body, they are most commonly found on the face, neck, and trunk.

Dermatological
  • What exactly is a skin cyst?
    MedlinePlusMay 2026

    A skin cyst is a small, closed sac under your skin that fills with fluid, air, or other material. Most skin cysts are harmless and grow slowly.

  • Can I get more than one cyst?
    MedlinePlusMay 2026

    Yes, you can develop more than one cyst on your skin. Some people are more prone to getting multiple cysts over time.

  • How common are skin cysts in people like me?
    MedlinePlusMay 2026

    Skin cysts are very common and affect many people. They can happen to anyone at any age, though some types are more common in certain age groups.

  • Is it possible for my cyst to go away on its own?
    MedlinePlusMay 2026

    Yes, some skin cysts go away on their own without treatment. However, others stay the same size or grow larger over time.

  • Could this be something else, like an infection?
    MedlinePlusMay 2026

    A cyst can become infected, but a simple cyst is not an infection itself. If your cyst becomes red, warm, painful, or drains pus, it may be infected and needs treatment.