TPO and autoimmune thyroid disease: A suitable reason for the association of trigger factors being commoner in those participants with anti-TPO Ab positivity than those without could not be ascertained and probably a larger study over a longer duration of time measuring association of thyroid autoimmunity with individual precipitating factors in vitiligo would be able to determine roles played by trigger factors in vitiligo and associated thyroid autoimmunity in vitiligo patients.