**Core Concept**
Sebaceous cysts are benign, encapsulated lesions that arise from the blockage of sebaceous glands, leading to the accumulation of keratin debris and sebum. They are commonly found on the skin, particularly on the face, neck, and scalp.

**Why the Correct Answer is Right**
Sebaceous cysts result from the obstruction of the sebaceous gland's duct, which prevents the normal drainage of sebum onto the skin's surface. This blockage leads to the accumulation of sebum and keratin, causing the cyst to form. The cyst is typically lined with a stratified squamous epithelium, and its wall is composed of a thick, fibrous capsule.

**Why Each Wrong Option is Incorrect**
**Option A:** Sebaceous cysts are not typically malignant, although they can become secondarily infected.
**Option B:** While sebaceous cysts can occur anywhere on the body, they are most commonly found on the face, neck, and scalp.
**Option C:** Sebaceous cysts are not caused by a viral infection, but rather by the blockage of the sebaceous gland's duct.

**Clinical Pearl / High-Yield Fact**
Sebaceous cysts can be distinguished from other skin lesions by their characteristic "dome-shaped" appearance and the presence of a small, central punctum (a small opening on the surface of the cyst).

**Correct Answer:** C. Sebaceous cysts result from the blockage of sebaceous glands.