Psoriasis in the Context of Dermatologic Disorders: A Comprehensive Overview

Psoriasis is a chronic, immune-mediated dermatosis that affects approximately 125 million people worldwide. Traditionally considered a dermatologic condition, it is now perceived as a systemic disease with numerous comorbidities. While its associations with psoriatic arthritis, metabolic syndrome, and psychiatric disorders are well established, less attention has been given to its coexistence with other dermatoses. This narrative review aims to explore and summarize the existing evidence on the relationships between psoriasis and other skin diseases, highlighting potential overlaps in clinical presentation, pathogenesis, and treatment challenges. Psoriasis may coexist with several inflammatory and autoimmune skin disorders, including atopic dermatitis, lichen simplex chronicus, anti-p200 pemphigoid, pityriasis rubra pilaris, seborrheic dermatitis, inflammatory linear verrucous nevus (ILVEN), Sneddon-Wilkinson disease, and vitiligo. The review highlights the shared genetic pathways (e.g., the Th1/Th17 axis and IL-17 pathway), diagnostic challenges (e.g., sebopsoriasis and psoriasis-eczema overlap), and therapeutic considerations (e.g., paradoxical reactions to biologics and effectiveness of JAK inhibitors in both psoriasis and vitiligo). The coexistence of psoriasis with other dermatoses is more common and clinically significant than previously appreciated. Recognizing these associations is crucial for an accurate diagnosis, avoiding mismanagement, and optimizing individualized treatment strategies. Further research is needed to elucidate the underlying mechanisms and improve the multidisciplinary care for patients with complex dermatologic presentations.