The rash described with the 4 P's that commonly affects the flexor surfaces is which condition?

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Study for the Step 3 UWSA Exam with our challenging quiz. Prepare with detailed explanations for each question, ensuring you're well-equipped for success. Enhance your understanding and boost your exam confidence!

Multiple Choice

The rash described with the 4 P's that commonly affects the flexor surfaces is which condition?

Explanation:
The four P’s—pruritic, purple, polygonal, planar—are the classic description of lichen planus, and it characteristically involves flexor surfaces such as the wrists and forearms. That combination makes lichen planus the best match for this description. Psoriasis typically shows extensor plaques with silvery scales; eczema (atopic dermatitis) is itchy and often affects flexures but doesn’t feature the four P’s; dermatitis herpetiformis presents as grouped vesicles on extensor surfaces and is tied to gluten sensitivity.

The four P’s—pruritic, purple, polygonal, planar—are the classic description of lichen planus, and it characteristically involves flexor surfaces such as the wrists and forearms. That combination makes lichen planus the best match for this description. Psoriasis typically shows extensor plaques with silvery scales; eczema (atopic dermatitis) is itchy and often affects flexures but doesn’t feature the four P’s; dermatitis herpetiformis presents as grouped vesicles on extensor surfaces and is tied to gluten sensitivity.

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