Arguments for the aggravating effect of thyroid hormones in psoriasis are the following [11]: Psoriasis is intensified by the excessive production of thyroid hormones [12], the free thyroxine is increased significantly in psoriatic patients [13], the patients with thyroiditis had more extended disease periods [13], and in severe psoriasis, there are increased levels of thyroid-stimulating hormone (TSH) [10]. This evidence concerns the gene TG and psoriasis.