It is an interventional study. Patients will be enrolled in the rheumatology department Of Ambroise Paré Hospital in collaboration with the dermatology departments of the hospital.
All patients with psoriatic arthritis, beginner or established, or patients with psoriasis suspecting the beginning of rheumatism who will consult or are already followed in those departments and give their approval for the study will undergo
* a clinical rheumatologic assessment (number of painful or swollen joints, enthesitic pain, inflammatory spinal pain)
* an ultrasound assessment (peripheral joints, tendon and enthesitic structures and nails).
Those assessment will be made the same day of their consult in one those departments. They will be asked to complete questionnaires (PROs) on the overall assessment of the disease, pain, quality of life, tiredness, physical limitation / disability and the impact of the disease.
