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Question 1
What is a primary lesion that is a small, raised, solid bump less than 0.5 cm in diameter, such as a mole or wart?
Answer: A papule. It is a small, elevated, solid lesion that does not contain fluid.
Question 2
What term describes a flat, discolored spot on the skin that is not raised or depressed, such as a freckle or flat birthmark?
Answer: A macule. It is a flat, non-palpable spot that differs in color from the surrounding skin.
Question 3
What type of primary lesion is a raised, fluid-filled blister larger than 0.5 cm in diameter?
Answer: A bulla. It is a large vesicle containing serous fluid.
Question 4
What is a wheal, and what common skin reaction causes it?
Answer: A wheal is a raised, itchy, transient lesion with an irregular border, typically caused by an allergic reaction such as hives (urticaria).
Question 5
What is the difference between a vesicle and a pustule?
Answer: A vesicle is a small, raised, fluid-filled sac containing clear serous fluid, while a pustule is a raised lesion filled with pus (infected fluid).