Which lesion is a raised, thin-walled, fluid-filled sac under the epidermis, containing clear or colored fluid?

Which lesion is a raised, thin-walled, fluid-filled sac under the epidermis, containing clear or colored fluid?

• A. Papule
• B. Vesicle
• C. Pustule
• D. Cyst

Answer: (B)

Vesicles are small, fluid-filled elevations that lie within or just beneath the epidermis. They are typically less than 1 cm in diameter and have a thin, delicate wall. The fluid inside can be clear or colored, giving a translucent appearance. This matches the description of a raised, thin-walled sac under the epidermis containing fluid. A papule is a solid bump with no fluid; a pustule contains pus and is usually infected and yellowish; a cyst is a closed sac that often lies deeper with a thicker wall and contains a semi-solid material or thicker fluid. If a vesicle grows larger than about 1 cm, it would be called a bulla instead.

Vesicles are small, fluid-filled elevations that lie within or just beneath the epidermis. They are typically less than 1 cm in diameter and have a thin, delicate wall. The fluid inside can be clear or colored, giving a translucent appearance. This matches the description of a raised, thin-walled sac under the epidermis containing fluid.

A papule is a solid bump with no fluid; a pustule contains pus and is usually infected and yellowish; a cyst is a closed sac that often lies deeper with a thicker wall and contains a semi-solid material or thicker fluid. If a vesicle grows larger than about 1 cm, it would be called a bulla instead.