Final answer:
Primary skin lesions are the initial skin changes caused by a disease or condition. Examples include pustules, ulcers, and vesicles.
Step-by-step explanation:
Primary skin lesions are the initial skin changes caused by a disease or condition. They can arise from various factors such as infections, inflammation, or damage to the skin. Examples of primary skin lesions include pustules, ulcers, and vesicles. Pustules are small raised bumps filled with pus, ulcers are open sores on the skin, and vesicles are fluid-filled blisters.