What is a flat spot or discoloration on the skin called?

A flat spot or discoloration on the skin is referred to as a macule. Macules are defined as localized changes in skin color that are flat and can vary in size. They do not have any elevation above the skin surface, which clearly distinguishes them from other skin lesions.

Nodules, on the other hand, are raised and can be felt above the skin surface, often firm in texture. Papules are small, raised bumps that can be felt as well and usually signify some type of inflammation or irritation. Pustules are small, pus-filled lesions that are also raised and indicative of infection or acne. Understanding these distinctions helps in accurately identifying various skin conditions and their appropriate descriptions.