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A spot or discoloration of the skin, neither raised nor sunken, is a:

  1. Papule

  2. Nodule

  3. Macule

  4. Wheal

The correct answer is: Macule

A spot or discoloration of the skin that is neither raised nor sunken is known as a macule. This differs from other skin lesions such as papules, which are small raised bumps, or nodules, which are larger and deeper bumps. A wheal is a raised red bump caused by an allergic reaction. So, none of the other options are correct because they all involve a visible elevation of the skin, whereas a macule is a flat discoloration.