TDH has been studied in the following inflammatory diseases: psoriasis vulgaris (5 studies), seborrheic dermatitis (1 study), atopic dermatitis-AD (2 studies), vitiligo (4 studies), cutaneous lichen planus-CLP (2 studies), acne vulgaris (1 study) and rosacea (2 studies). This evidence concerns the gene TDH and Alzheimer disease.