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Which of the following is NOT a characteristic feature of psoriasis, aiding in its diagnosis?

D.

velopment of wheals and hives

K.

ebner phenomenon upon skin trauma

Answer and Explanation

The Correct Answer is C

Explanation: The development of wheals and hives is not characteristic of psoriasis. Wheals and hives are associated with urticaria (hives), which is a separate skin condition caused by histamine release.

Incorrect choices: a. Pitting and ridging of the nails: Pitting and ridging of the nails are common nail changes seen in psoriasis and can aid in its diagnosis.

b. Koebner phenomenon upon skin trauma: The Koebner phenomenon, where new psoriatic lesions form at sites of skin trauma or injury, is a characteristic feature of psoriasis.

d. Silvery-white scales on erythematous plaques: Silvery-white scales on erythematous (red) plaques are a classic feature of psoriasis and help differentiate it from other skin conditions.


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Related Questions

Correct Answer is D

Explanation

Explanation: Psoriasis lesions commonly appear in a symmetrical pattern, affecting similar areas on both sides of the body. For example, if a plaque is present on the right elbow, there is a high likelihood of a corresponding plaque on the left elbow.

Incorrect choices: a. Psoriasis lesions are evenly distributed across the body: Psoriasis lesions are not evenly distributed and tend to cluster in certain areas, such as elbows, knees, scalp, and lower back.

b. Psoriasis lesions are typically limited to the face and neck: While psoriasis can occur on the face and neck, it is more commonly found on extensor surfaces (elbows and knees) and the scalp.

c. Psoriasis lesions are more commonly found on the left side of the body: There is no evidence to support a preference for the left side of the body in psoriasis distribution. The symmetrical pattern is a more characteristic feature.

Correct Answer is B

Explanation

Explanation: A definitive diagnosis of psoriasis is often made through a skin biopsy, where a small sample of the affected skin is taken and examined under a microscope to confirm the presence of psoriasis-related changes.

Incorrect choices: a. Blood tests are not used to diagnose psoriasis, as it is not caused by a bacterial infection.

c. Chest X-rays are not part of the diagnostic process for psoriasis, as it primarily affects the skin and not the lungs.

d. Urinalysis is not used to diagnose psoriasis, as it does not provide relevant information about the skin condition.

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