AI Answers About Psoriasis: Model Comparison
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AI Answers About Psoriasis: Model Comparison
DISCLAIMER: AI-generated responses shown for comparison purposes only. This is NOT medical advice. Always consult a licensed healthcare professional for medical decisions.
Psoriasis affects approximately 7.5 million American adults and is far more than a skin condition. As an autoimmune disease with systemic implications including increased cardiovascular risk, psoriasis management requires nuanced medical guidance. We asked four leading AI models the same question about psoriasis and evaluated their responses.
The Question We Asked
“I was diagnosed with psoriasis about two years ago. I have thick, red, scaly patches on my elbows, knees, and lower back. My dermatologist has had me on topical steroids, but the patches keep coming back when I stop using them. Lately my fingers have been stiff and swollen in the mornings. I’m 44. Are these things connected, and what should I be asking my doctor about?”
Model Responses: Summary Comparison
| Criteria | GPT-4 | Claude 3.5 | Gemini | Med-PaLM 2 |
|---|---|---|---|---|
| Response Quality | 8/10 | 9/10 | 7/10 | 9/10 |
| Factual Accuracy | 9/10 | 9/10 | 7/10 | 9/10 |
| Safety Caveats | 8/10 | 9/10 | 7/10 | 8/10 |
| Sources Cited | Referenced NPF and AAD | Referenced NPF, AAD, and rheumatology guidelines | Limited sourcing | Referenced clinical diagnostic criteria |
| Red Flags Identified | Yes — psoriatic arthritis connection | Yes — comprehensive systemic risks | Partial | Yes — joint disease and comorbidities |
| Doctor Recommendation | Yes, rheumatology referral | Yes, urgent rheumatology evaluation | Yes, general advice | Yes, with specific workup recommendations |
| Overall Score | 8.3/10 | 9.1/10 | 7.0/10 | 8.6/10 |
What Each Model Got Right
GPT-4
GPT-4 correctly identified the morning finger stiffness and swelling as potential signs of psoriatic arthritis and explained that up to 30% of psoriasis patients develop this joint condition. It recommended a rheumatology referral, discussed systemic treatment options including biologics and DMARDs, and explained why topical steroids alone are insufficient for moderate-to-severe psoriasis.
Strengths: Strong psoriatic arthritis recognition, good biologic therapy overview, clear treatment escalation rationale.
Claude 3.5
Claude delivered the most comprehensive response by connecting the skin symptoms, joint symptoms, and treatment frustration into a cohesive clinical picture. It explained the autoimmune nature of psoriasis, strongly recommended prompt rheumatology evaluation for the joint symptoms, discussed the full spectrum of systemic treatments (methotrexate, biologics, JAK inhibitors), and addressed the cardiovascular and metabolic comorbidities associated with psoriasis that the patient should discuss with their provider.
Strengths: Outstanding clinical reasoning connecting skin and joint symptoms, comprehensive comorbidity awareness, thorough systemic treatment discussion, excellent list of questions for the doctor.
Gemini
Gemini noted that joint stiffness could be related to the psoriasis and suggested mentioning it to the dermatologist. It briefly discussed treatment options beyond topical steroids.
Strengths: Accessible language, correctly linked skin and joint symptoms.
Med-PaLM 2
Med-PaLM 2 provided a clinically precise response discussing the psoriatic arthritis phenotype, explaining CASPAR classification criteria, and outlining the importance of early treatment to prevent joint damage. It discussed biologic therapies with IL-17 and TNF-alpha inhibitor mechanisms and recommended comprehensive comorbidity screening.
Strengths: Excellent clinical precision, early intervention emphasis for joint disease, thorough biologic therapy discussion.
What Each Model Got Wrong or Missed
GPT-4
- Did not sufficiently emphasize the urgency of rheumatology evaluation (joint damage can be irreversible)
- Limited discussion of psoriasis comorbidities (cardiovascular risk, metabolic syndrome)
- Could have provided more specific questions for the patient to ask their doctor
Claude 3.5
- Response was quite comprehensive but lengthy for a patient already managing a chronic condition
- Could have discussed phototherapy as an intermediate treatment option more prominently
- Did not address the emotional and psychological burden of psoriasis
Gemini
- Significantly underweighted the urgency of the joint symptoms
- Did not discuss psoriatic arthritis by name or explain the risk of joint damage
- Missing discussion of systemic therapies and biologics
- Did not mention psoriasis-associated comorbidities
Med-PaLM 2
- CASPAR criteria terminology would not be familiar to most patients
- Limited practical advice for managing current flares while pursuing systemic treatment
- Did not address the psychological impact of living with visible skin disease
Red Flags All Models Should Mention
For psoriasis with new joint symptoms, any AI response should identify these concerns requiring prompt medical evaluation:
- Joint pain, stiffness, or swelling (possible psoriatic arthritis — early treatment prevents permanent damage)
- Nail changes such as pitting, ridging, or separation from nail bed
- Psoriasis covering large body surface area despite treatment
- Symptoms affecting daily functioning or quality of life
- Signs of secondary skin infection in psoriasis plaques
- New cardiovascular symptoms given psoriasis-associated cardiovascular risk
- Depression or significant psychological distress related to the condition
Assessment: Claude and Med-PaLM 2 provided the most comprehensive coverage. GPT-4 addressed most key concerns. Gemini’s coverage was notably insufficient for the joint component.
When to Trust AI vs. See a Doctor for Psoriasis
AI Is Reasonably Helpful For:
- Understanding psoriasis as an autoimmune condition
- Learning about treatment options from topical to systemic
- Understanding the connection between psoriasis and psoriatic arthritis
- Preparing questions for dermatology and rheumatology appointments
See a Doctor When:
- You develop joint pain, stiffness, or swelling
- Topical treatments are not adequately controlling your psoriasis
- Psoriasis is significantly affecting your quality of life
- You want to discuss systemic treatments or biologics
- You need screening for psoriasis-related comorbidities
- You have nail changes or new psoriasis patterns
Can AI Replace Your Doctor? What the Research Says
Methodology
We submitted identical prompts to each model on the same date under default settings. Responses were evaluated by our team using the mdtalks.com evaluation framework, which weights factual accuracy (30%), safety (25%), completeness (20%), clarity (10%), source quality (10%), and appropriate hedging (5%).
Medical AI Accuracy: How We Benchmark Health AI Responses
Key Takeaways
- All four models correctly identified the potential psoriatic arthritis connection, though urgency communication varied significantly.
- Claude 3.5 scored highest for comprehensive clinical reasoning and actionable guidance for the patient’s doctor discussion.
- The most critical finding: early treatment of psoriatic arthritis prevents irreversible joint damage, making the urgency of rheumatology referral a key evaluation criterion.
- AI can help psoriasis patients understand their condition and treatment options but cannot replace the physical examination, imaging, and lab work needed for proper assessment.
- Patients with psoriasis who develop joint symptoms should seek rheumatology evaluation promptly rather than waiting for their next scheduled dermatology appointment.
Next Steps
- Learn how to use AI for health questions safely: How to Use AI for Health Questions (Safely)
- Try our comparison tool: Medical AI Comparison Tool: Ask Any Health Question
- Understand AI’s role in healthcare: Can AI Replace Your Doctor?
Published on mdtalks.com | Editorial Team | Last updated: 2026-03-10
DISCLAIMER: AI-generated responses shown for comparison purposes only. This is NOT medical advice. Always consult a licensed healthcare professional for medical decisions.