HLA-B and psoriasis: Others include obesity, the presence of arthralgia, severe psoriasis, a history of uveitis, nail psoriasis, scalp psoriasis, having a first-degree relative with PsA, and any associated gene (such as human leukocyte antigens [HLA]-B*08, HLA-B*27, HLA-B*38, and HLA-B*39) [6,21].