Psoriasis
Psoriasis ( 40 Questions)
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.
No explanation
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.