TPO and acne: The following are among the strengths of the study: unlike other studies that investigate the severity of acne in patients with antithyroid antibodies compared with a control group (without acne), this study investigates the incidence of AIT in patients with acne and evaluates its severity, compared with both patients with acne without AIT, and depending on the presence and levels of TG and TPO (separately and together, in the group with AIT).