Primary skin lesions are original skin changes; secondary lesions develop from changes to primary lesions. Which option best captures this distinction?

• A. Primary lesions are original skin changes (such as macules or papules). Secondary lesions develop from changes to primary lesions (such as scars or crusts)
• B. Primary lesions are always vascular; secondary lesions are inflammatory
• C. Primary lesions are deeper than secondary
• D. Primary lesions are cosmetic; secondary lesions are functional

Answer: (A)

The main idea is that primary lesions are the initial skin changes that appear on otherwise normal skin, reflecting the immediate reaction to disease or injury. Examples include macules (flat spots), papules (raised solid bumps), vesicles, pustules, and wheals. Secondary lesions are not new disease processes but develop as the primary changes evolve or are altered by later factors such as scratching, drying, infection, or healing. Crusts form from dried exudate, scales from excess shedding, scars from healing, ulcers from tissue loss, fissures from cracking, and atrophy or keloids from the healing process. So the best statement captures that primary lesions are original changes, while secondary lesions arise from changes to those primary lesions.