BP has been associated with both Hashimoto thyroiditis and Graves’ disease.91–93 Indeed, there is a higher prevalence of anti-TPO antibodies in BP when compared to control subjects and this was not observed in pemphigus patients.94 Women affected by gestational pemphigoid demonstrated a higher prevalence of Hashimoto thyroiditis and Graves’ disease.16 This evidence concerns the gene TPO and pemphigus.