Which term refers to a thin closed sac that contains fatty secretions from a sebaceous gland?

• A. Abscess
• B. Tumor
• C. Sebaceous cyst
• D. Lesion

Answer: (C)

A sebaceous cyst is a small, closed sac that forms when a sebaceous gland becomes blocked, causing sebum (the oily secretions) to accumulate inside. The term describes both the sac-like structure (a cyst) and its content (sebum from a sebaceous gland), which is why it fits best for a thin-walled, fatty substance-filled lesion. This distinguishes it from an abscess, which contains pus and is typically painful and inflamed; from a tumor, which is a neoplastic growth; and from a lesion, which is a broad, nonspecific term. In exam-style language, sebaceous cyst specifically conveys a closed sac filled with fatty secretions derived from a sebaceous gland.