Plaque Psoriasis Diagnosis and Treatment

Clinical Presentation

The American Academy of Dermatology notes that salmon-colored (erythematous) plaques with white (silvery) scales on the scalp and elbows are pathognomonic for psoriasis vulgaris 1, 2
Classic distribution involving extensor surfaces (elbows) and scalp represents typical locations for plaque psoriasis 3, 1
Mild pruritus is commonly associated with psoriasis, though the severity varies, as reported by the American Academy of Dermatology 4

The American Academy of Dermatology defines mild psoriasis as limited body surface area (BSA) involvement, with less than 3% BSA affected, such as the scalp and elbows only 1, 2
No evidence of joint involvement (psoriatic arthritis) is a characteristic of mild disease, according to the American Academy of Dermatology 4

The American Academy of Dermatology recommends high-potency topical corticosteroids as first-line therapy for mild psoriasis 1, 2
Combination with vitamin D analogues (such as calcipotriene) enhances efficacy and is recommended by the American Academy of Dermatology 1, 2
For scalp involvement, scalp formulations of corticosteroids and vitamin D analogues (solutions, foams, or shampoos) improve penetration through hair, as suggested by the American Academy of Dermatology 1
The American Academy of Dermatology recommends considering systemic therapy or phototherapy if BSA involvement exceeds 3-10% (moderate disease) or >10% (severe disease) 1, 2
Development of psoriatic arthritis (joint pain, swelling, stiffness) is an indication for systemic treatment, according to the American Academy of Dermatology 4, 7

The American Academy of Dermatology suggests assessing pruritus severity using visual analog scale (VAS) or numeric rating scale (NRS), as significant pruritus requires specific management 5
Screening for psoriatic arthritis is recommended, as up to 25-30% of psoriasis patients develop joint involvement, according to the American Academy of Dermatology 3
Evaluation for comorbidities, such as cardiovascular disease, metabolic syndrome, diabetes, inflammatory bowel disease, and depression, is necessary, as reported by the American Academy of Dermatology 4