A 60-year-old man presents with diffuse, salmon-colored erythema and scaling of the skin with distinct islands of normal skin within the affected areas. Examination reveals follicular, keratotic papules on the dorsal aspects of his fingers.

• A Psoriasis vulgaris
• B Ichthyosis vulgaris
• C Sézary syndrome
• D Pityriasis rubra pilaris ✓

Explanation

Pityriasis rubra pilaris is characterized by salmon-colored plaques with characteristic islands of sparing and keratotic follicular papules on the dorsal fingers. Psoriasis lacks islands of sparing and has silvery scales. Sézary syndrome presents with exfoliative erythroderma but lacks islands of sparing. Ichthyosis vulgaris presents with generalized fish-like scales but not islands of sparing.

Reference: Robbins and Cotran Pathologic Basis of Disease, 10th ed.

High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP

Written and medically reviewed by the StethoPrep medical team.