The current study select eight INDEL in seven genes (CYP19A1, NFKβ1, IL1α, CASP8, UGT1A1, PAR1, CYP2E1, and IL4), which have relation with the immune response modulation in leprosy patients, beside literature that demonstrate these molecular markers like functional polymorphisms that alter transcriptional activity of the gene, and consequently the immunological phenotype against the bacilli. The gene discussed is IL4; the disease is leprosy.