What type of skin spot may appear from healing processes such as those left by acne?

The correct answer is that scars may form as a result of the healing process from acne. When acne lesions heal, particularly deep or cystic acne, they can leave behind scars due to damage in the skin's deeper layers. Scarring differs from other options like macules, which are flat, discolored spots that do not involve any structural change in the skin, or nodules, which are raised solid lesions that occur beneath the skin's surface.

Scars indicate a change in the texture and integrity of the skin, often presenting as depressions or raised areas, and reflect the skin's response to injury. Proper understanding of scar formation is crucial in skincare, especially when addressing concerns left by acne, as treatments can vary based on the type and severity of the scars. Thus, recognizing that scars are a result of the healing processes highlights the importance of managing acne effectively to minimize long-lasting effects on the skin’s appearance.