Epithelial-lined cavities that lie below the body surface and contain liquid or semisolid material are known as:

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Bullae, vesicles, and pustules are all fluid-filled lesions that occur within or on top of the skin. Cysts, on the other hand, are closed, sac-like structures that are lined with epithelium (the type of tissue that covers the body surface and lines many organs internally) and contain fluid, semi-solid, or solid material. They can occur anywhere in the body and are often benign, but sometimes can be a symptom of a more serious condition.

Epithelial-Lined Cavities That Lie Below the Body Surface and Contain