Extensive Psoriasis on a Male's Skin

Description

Posterior trunk skin is shown with multiple well-demarcated erythematous plaques covered by adherent silvery-white scale, concentrated over the lumbosacral region and extending superiorly toward the mid-back. Several lesions straddle the posterior midline, while others spread laterally toward the paraspinal and posterior flank skin, with islands of uninvolved skin separating confluent areas. The plaques vary from small, discrete ovoid lesions to broad coalescent patches, and the surface scale creates a rough, flaky texture against otherwise normal-appearing surrounding integument. A white garment obscures the inferior gluteal region and upper thighs. Plaque psoriasis on the back is a common pattern clinicians grade for body surface area involvement and therapeutic response, because trunk plaques often respond differently than scalp or intertriginous disease and may require higher-potency topical corticosteroids, vitamin D analogs, or targeted phototherapy. Back lesions are also a frequent site for Koebnerization after friction from clothing or belts, and heavy scale can mask secondary fissuring that predisposes to pain and excoriation. In practice, this distribution prompts consideration of comorbid psoriatic arthritis screening and cardiometabolic risk, while the sharp borders and micaceous scale help separate psoriasis from nummular eczema, tinea corporis, and pityriasis rosea. Dermatology and primary care educators can use this image when teaching plaque morphology, lesion distribution on the posterior trunk, and documentation of extent in clinic notes or teledermatology consults. It also fits well in board-style review materials, patient education on chronic inflammatory dermatoses, and publisher layouts comparing inflammatory papulosquamous disorders. Anatomical accuracy verified by SciePro's Medical Advisory Board.