Psoriasis: A Review of Diagnosis and Treatment in the Primary Care Setting Consultant360 Biologic and Small Molecule Therapies for Moderate to Severe Psoriasis: Focus on Psoriasis Comorbidities BioDrugs Springer Nature Link Many treatment guidelines for psoriasis rely heavily on body surface area (BSA) involvement to determine disease severity and eligibility for systemic therapies like biologics. Traditionally, patients with less than 10% BSA involvementespecially Preventing psoriatic arthritis: focusing on patients with psoriasis at increased risk of transition Nature Reviews Rheumatology