Which term refers to an elevated, thin-walled lesion that contains clear fluid?

The term that refers to an elevated, thin-walled lesion containing clear fluid is vesicle. Vesicles are small blisters that appear on the skin and are typically filled with a serous or clear fluid. They can arise from various skin conditions, including infections like herpes simplex and other inflammatory processes.

Understanding the characteristics of a vesicle is crucial, as this type of lesion helps in diagnosing various dermatological conditions. In contrast, a plaque is a larger, raised area of skin that may be dry or scaly, a nodule is a solid, raised lesion that's typically deeper than a vesicle, and a keloid is an overgrowth of scar tissue that forms at the site of a healed skin lesion. All these other terms refer to different types of skin lesions with distinct appearances and underlying pathophysiology, underscoring the importance of precise terminology in dermatology.