TPO and parasitic infectious disease: All physical examinations and laboratory tests, including differential blood count (to assess for any hematologic abnormalities), C-reactive protein (to detect systemic inflammation), thyroid-stimulating hormone (to evaluate thyroid function, as thyroid disorders can be associated with chronic urticaria), anti-thyroid peroxidase (anti-TPO) and anti-thyroglobulin (anti-TG) antibodies (to screen for autoimmune thyroid disease), and stool examination for parasites (to rule out parasitic infections as potential triggers), were unremarkable.