Table 1: Inclusion and exclusion criteria for participation in the study.

Inclusion criteria:
(i) Psoriasis vulgaris moderate-severe (Psoriasis Area Severity Index) PASI > 6
(ii) Psoriatic arthritis diagnosed according to Classification Criteria for Psoriatic Arthritis (CASPAR)
(iii) Rheumatoid arthritis diagnosed according to American College of Rheumatology criteria (ACR)
Exclusion criteria:
(i) Nail psoriasis
(ii) Primary or secondary Raynaud's phenomenon
(iii) Acrocyanosis
(iv) Cardiovascular risk factors and/or coagulopathy
(v) Vasoactive therapies and/or anticoagulants