Co-occurrence of Rheumatoid Arthritis, Sarcoidosis, and Lichen Planus

Triple coexistence is rare but possible. All three are immune-mediated with overlapping features:

• Rheumatoid Arthritis (RA): Chronic symmetric polyarthritis; systemic autoimmunity (RF, anti-CCP).
• Sarcoidosis: Non-caseating granulomas in lungs, nodes, skin, eyes; multisystem.
• Lichen Planus: T-cell-mediated mucocutaneous eruption (pruritic, violaceous papules, Wickham striae).

Shared Symptoms

• Joint pain/swelling, fatigue, skin lesions

Critical Distinction

Different pathophysiology, diagnostics, and treatments. Rheumatology + dermatology + pulmonology collaboration essential for accurate diagnosis and management.