MIF and psoriatic arthritis: High MIF levels have been associated with two polymorphisms of the MIF gene (SNP ‐173 G>C and STR ‐794 CATT5‐8),10, 11 as well as with enhanced risk to develop autoimmune, infectious, and chronic inflammatory,12, 13, 14, 15 including psoriasis,16, 17 psoriatic arthritis, and systemic sclerosis in the Mexican population.13, 18, 19