PRGF supernatants from donors with dermatitis show higher expression levels of FETUA than those of psoriasis [FC = 1.6; p = 0.04] or lichen donors [FC = 1.3; p = 0.009], whereas TPM4 was downregulated in samples from lichen donors with respect to dermatitis [FC = 0.58; p = 0.01] or psoriasis donors [FC = 0.52; p = 0.004]. The gene discussed is TPM4; the disease is psoriasis.