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Severity of Psoriasis

Mild disease:<5% of body surface covered (65% of patients with this type)
Moderate disease: 5-10% of body surface area covered (25% of patients with this type)
Severe disease: >10% of body surface area covered or palm/sole involvement (10% of patients with this type)

Psoriasis Sites and Age

Common sites – bilaterally symmetrical
- Elbows
- Knees
- Scalp
- Lowerback
- Genitalia

May manifest at any stage of life but 2 peak periods are identified *:
- between the age of 16 and 22 years
- 57 and 60 years


Exact cause remains unknown May be a combination of risk factors including genetic predisposition, faulty immune function and environmental factors Genetic Factors: - 30% of people with psoriasis have had psoriasis in family - Autosomal dominant inheritance Inappropriate immune response: Immune system mistakes some part of the body as a pathogen and attacks its own cells Nongenetic Factors: - Mechanical, ultraviolet, chemical injury - Infections: Strep, viral, HIV - Prescription Drugs, stress, endocrine, hormonal, obesity, alcohol, smoking