A patch is defined as a flat discoloration greater than 2 cm. Which option matches this definition?

A patch is defined as a flat discoloration greater than 2 cm. Which option matches this definition?

• A. A patch is a raised lesion
• B. A patch is a fluid-filled blister
• C. A patch is a flat discoloration greater than 2 cm
• D. A patch is smaller than 1 cm

Answer: (C)

Understanding patches begins with recognizing they are flat areas of skin color change. The size matters: a patch is a flat discoloration that is larger than a specific threshold. In this item, the threshold is greater than 2 cm, so describing a patch as a flat discoloration larger than 2 cm matches precisely. This means the patch is not raised and not fluid-filled, and it’s bigger than the smaller category used for macules. The other descriptions point to different lesion types: a raised lesion indicates elevation above the skin surface; a fluid-filled blister is a vesicle or bulla that contains fluid; and describing something smaller than 1 cm corresponds to a macule, not a patch. Grasping these distinctions—flat versus raised, color change versus fluid-filled, and the size threshold—helps you identify the correct term quickly in clinical descriptions.

Understanding patches begins with recognizing they are flat areas of skin color change. The size matters: a patch is a flat discoloration that is larger than a specific threshold. In this item, the threshold is greater than 2 cm, so describing a patch as a flat discoloration larger than 2 cm matches precisely. This means the patch is not raised and not fluid-filled, and it’s bigger than the smaller category used for macules. The other descriptions point to different lesion types: a raised lesion indicates elevation above the skin surface; a fluid-filled blister is a vesicle or bulla that contains fluid; and describing something smaller than 1 cm corresponds to a macule, not a patch. Grasping these distinctions—flat versus raised, color change versus fluid-filled, and the size threshold—helps you identify the correct term quickly in clinical descriptions.