Question
A 35 year old male presented with silvery scales on elbow & knee that bleed on removal . The probable diagnosis is
| A. |
Pityriasis rosea
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| B. |
Psoriasis vulgaris
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| C. |
Secondary Syphilis
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| D. |
Seborrheic Dermatitis
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Show Answer
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Correct Answer � B
Explanation
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Correct answer : b
Psoriasis vulgaris is Well demarcated erythematous indurated plaque with silvery white (mica like) scaling over scalp, extensors , (elbows ,knees ,knuckles & lower back) , palms & soles .
Silvery white scaling is due to the presence of air trapped in between scales.
Auspitz sign: Scratching of lesion of psoriasis with a glass slide leads to pinpoint bleeding as the end result and it is known as Auspitz sign.
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