We have examined various autoimmunity parameters in AIDS with special emphasis on the expression of pemphigus and bullous pemphigoid antibodies. Sera from healthy seropositive individuals without syphilis (CS-, n = 17), seropositive individuals with syphilis (cs+, n = 11), and patients with AIDS (n = 6) were studied and compared with normal controls (n = 30); autoimmunity parameters related to dermatology were evaluated. Indirect immunofluorescence (IIF) for pemphigus and pemphigoid antibodies, antinuclear antibodies (ANA), anti-DNA antibodies, antismooth muscle antibodies (ASMA) antimitochondrial antibodies (AMA), and antithyroid antibodies (ATA) was carried out and findings were graded with a cumulative index (CI) for each patient group. Pemphigus and bullous pemphigoid-like antibodies (IgG, PV + BP) were detected in 33% of the AIDS patients. Statistically increased CI (P less than 0.01) was found in the CS- group compared with the CS+ group and in the AIDS group compared with CS- (P less than 0.01).