In the saliva anti-BP180-NC16A negative group, glycans binding to SNA negatively correlated with BP180 (r=-0.83, p<0.05), erythema score (r=-0.79, p<0.05), mucosal score (r=-0.75, p<0.05), and BPDAI (r=-0.83, p<0.05), while PSA positively correlated with BP230 (r=0.74, p<0.05). The gene discussed is DST; the disease is Erythema.