A man in his 60s presented with a 2-week history of a papulosquamous eruption. He remained systemically well and denied recent infective symptoms or arthralgia. He had no medical comorbidities and took no new or long-term medications. On physical examination, he had multiple well-defined erythematous circular plaques, with thick concentric ringlike scale, widespread across his trunk and upper and lower limbs (Figure). This was accompanied by palmoplantar keratoderma, but no nail changes. Laboratory examination results, including streptococcal, treponemal, and HIV blood tests, did not reveal any abnormalities, apart from mild elevation in C-reactive protein levels (3.8 mg/dL [to convert to mg/L, multiply by 10]). Skin biopsy results demonstrated confluent parakeratosis, neutrophils within the stratum corneum, diminished granular layer, psoriasiform hyperplasia, and telangiectasia within dermal papillae. A diagnosis of rupioid psoriasis was made based on clinical and histopathological features.