Psoriasis Treatment Algorithm

Initial Disease Severity Assessment

The American Academy of Dermatology recommends treatment selection for psoriasis based on disease severity, with mild disease (<5% body surface area) treated with topical therapy alone, while moderate-to-severe disease (≥5% BSA) requires systemic therapy or phototherapy 1, 2
Assessment must include body surface area (BSA), symptom burden, quality of life impact, and special site involvement, with a threshold of 5% BSA separating mild from moderate-to-severe disease 1, 2

The American Academy of Dermatology recommends calcipotriene/betamethasone dipropionate combination product once daily for 4-8 weeks as first-line treatment for mild psoriasis, achieving clear or almost clear status in 48-74% of patients 4, 5
The strength of recommendation for calcipotriene/betamethasone dipropionate is A 4, 5
For moderate-to-severe psoriasis, the American Academy of Dermatology-National Psoriasis Foundation guidelines recommend biologics as first-line treatment due to superior efficacy and acceptable safety profiles 1
Narrowband UVB phototherapy 2-3 times weekly is highly effective for moderate-to-severe psoriasis and is the preferred first-line option for pregnant women 6, 2

For erythrodermic psoriasis, initiate oral cyclosporine 4 mg/kg/day immediately for rapid control, with dramatic improvement expected within 2-3 weeks 6, 7, 3
For pustular psoriasis, ustekinumab at 90mg dose is recommended as monotherapy, showing 67% clearance rate, with a strength of recommendation of C 7
For guttate psoriasis, UVB phototherapy has the most robust evidence for efficacy 7
For psoriatic arthritis, TNF inhibitors (infliximab, etanercept, adalimumab) are recommended for severe disease, with a strength of recommendation of A 1

Long-term use of high-potency corticosteroids beyond 12 weeks requires careful physician supervision to monitor for skin atrophy, striae, telangiectasia, and HPA axis suppression 3
Phototherapy must be supervised by adequately trained personnel with regular equipment calibration 7
Vitamin D analogues should be applied after phototherapy treatment to avoid inactivation by UVA and blocking of UVB radiation 4, 5, 3