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What do you call a fluid-filled sac under the skin that is generally benign?

  1. Cyst

  2. Pustule

  3. Vesicle

  4. Papule

The correct answer is: Cyst

A fluid-filled sac under the skin that is generally benign is referred to as a cyst. Cysts are enclosed sacs that can contain fluid, gas, or semi-solid substances and are typically formed as a result of various factors, including inflammation, infection, or blockages in gland ducts. They can vary in size and may be found anywhere on the body. In contrast, pustules are small, inflamed, pus-filled lesions that usually appear on the skin as a result of acne or infection. Vesicles are small blisters filled with clear fluid, often associated with conditions like herpes or chickenpox. Papules are raised, solid bumps on the skin that can be caused by various conditions and do not contain a fluid sac.