I am going to answer the sample USMLE Step 1 Questions with Explanation. These questions are available at USMLE.org
A 14-year-old girl is brought to the office by her mother because of a 3-month history of red bumps on her skin. The patient says the bumps are not itchy or painful but that she finds them embarrassing. She has no history of major medical illness and takes no medications. Her vital signs are within normal limits. Physical examination shows the findings in the photograph. Which of the following is the most likely diagnosis?
(A) Eczema
(B) Folliculitis
(C) Hidradenitis
(D) Keratosis pilaris
(E) Urticaria
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Answer
Keratosis pilaris is a common, benign skin condition characterized by small, red or flesh-colored bumps on the skin, typically on the upper arms, thighs, buttocks, and sometimes on the face. These bumps are often described as feeling rough, but they are not usually itchy or painful. They can be more noticeable in certain lighting or during changes in temperature. This condition often becomes more apparent during adolescence and may improve with age.
The lack of itching or pain, along with the appearance of the bumps, fits with the presentation of keratosis pilaris.
The correct answer is D
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