HLA-A and vitiligo: In addition to these, HLA-A*33, HLA-Aw*31, HLA-DR4, HLA-DR7, and HLA-DQB1*0303, among others, have been identified as risk factors for vitiligo in different samples.20, 21 On the other hand, there are studies that correlate HLA-A*09 and HLA-Aw*19 with a lower risk for the disease.21