A study of 74 Brazilian patients with drug‐induced SCAR (severe cutaneeous adverse reactions) included 11 patients exposed to allopurinol, of whom five were heterozygous for HLA‐B*57:01, leading the authors to conclude that HLA genotyping allowed identification of risk alleles, thus “reinforcing their implication in SCAR induced by allopurinol and other drugs among the Brazilian population”.23 This evidence concerns the gene HLA-B and Scarring.