Carriage of HLA-B*58:01 has been shown to be associated with allopurinol-induced Stevens-Johnson syndrome and toxic epidermal necrolysis (SJS/TEN) and drug reaction with eosinophilia and systemic symptoms (DRESS) in many populations globally; however, there is a critical need to investigate whether this is generalizable to populations of mixed ancestry, such as those in the US. Here, HLA-B is linked to Schwartz-Jampel syndrome.