Early Neuropsychiatric and Cutaneous Manifestations as Sentinel Signs of Systemic Disease

Abstract

Systemic diseases may present with cutaneous, neurological, or psychiatric manifestations before the classical diagnostic phenotype becomes fully established, creating a clinically relevant prediagnostic window. This study analyzed the main neuropsychiatric and cutaneous manifestations associated with systemic lupus erythematosus, Sjögren syndrome, Behçet disease, sarcoidosis, antiphospholipid syndrome, and systemic vasculitis, with emphasis on their temporal relationship with definitive diagnosis and their potential value as early warning signs. An integrative literature review based on the scientific method was conducted using evidence obtained from PubMed/MEDLINE, Scopus, Web of Science, and Google Scholar. The analysis considered the type of systemic disease, cutaneous findings, neurological or psychiatric manifestations, predominant pathophysiological mechanisms, and timing in relation to diagnosis. The reviewed evidence showed that systemic lupus erythematosus presented the broadest clinical heterogeneity, while neurological manifestations in Sjögren syndrome may precede classical glandular symptoms. Recurrent mucosal ulceration was particularly relevant in Behçet disease, granulomatous skin lesions provided diagnostic support in sarcoidosis, and vascular skin abnormalities were associated with neurological ischemic events in antiphospholipid syndrome and systemic vasculitis. The most recurrent mechanisms included autoimmune-inflammatory, vascular-thrombotic, vasculitic, and granulomatous pathways. Clinically relevant combinations included purpura with peripheral neuropathy, livedoid skin changes with cerebrovascular events, recurrent mucosal ulceration with neurological inflammation, photosensitive lesions with neuropsychiatric abnormalities, and granulomatous skin disease with neurological involvement. These findings indicate that isolated manifestations have limited specificity, whereas coherent multisystem patterns may increase suspicion of an underlying systemic disorder. Integrating dermatological and neuropsychiatric findings into multidisciplinary clinical assessment may contribute to earlier diagnostic recognition and reduce delays before significant organ involvement develops.