CD4 and vitiligo: The higher IFN-γ : IL-10 ratio noted in our patients compared to controls corroborates the cell based studies of Dwivedi et al. and Nigam et al. from India who observed a decrease in the ratio of CD4+/CD8+ T cells in vitiligo patients compared to controls signifying the role of T cell mediated pathogenesis in vitiligo [18, 21].