LGI1 and psoriasis: However, within LGI1-antibody patients, five of six patients with antibiotic-induced rashes carried HLA-B*57:01 known to associate with risk of rash to abacavir and flucloxacillin (Yip et al., 2015), and four of six patients with psoriasis harboured the psoriasis risk allele C*06:02 (Arakawa et al., 2015), suggesting the extended haplotypes may explain these specific co-morbidities.