Which lesion is known as a neoplasm, an abnormal mass of tissue in the skin that can be fluid-filled or solid?

• A. Nodule
• B. Vesicle
• C. Tumor
• D. Papule

Answer: (C)

A tumor is the term used for an abnormal new growth in the skin that forms a mass. It can be solid or have fluid-filled components, depending on the type, which is why it best fits the description of a neoplasm. The other terms describe specific kinds of lesions rather than the concept of an abnormal tissue growth: a vesicle is a small fluid-filled blister, a papule is a small raised solid bump, and a nodule is a larger, solid bump deeper in the skin. So, tumor correctly captures the idea of an abnormal mass arising from tissue growth.