Exploratory Study on Quality of Life in Patient With Moderate Psoriasis and Moderate Psoriatic Arthritis

This study will recruit three cohorts of 40 patients each: moderate psoriatic arthritis and moderate psoriasis, mild psoriatic arthritis and moderate psoriasis, moderate psoriatic arthritis and mild psoriasis. Eligible patients will fill the following questionnaires: Dermatology Life Quality Index (DLQI), Health Assessment Questionnaire (HAQ), EQ-5D, Functional Assessment of Chronic Illness Therapy-Fatigue (FACIT-fatigue) and 36-Item Short Form Health Survey Questionnaire (SF-36). In addition, each patient will be asked on a 4 point Likert scale how much their answer to each question is related to the impact of their skin disease or their psoriatic arthritis.