BackgroundAn oral condition associated to psoriasis is benign migratory glossitis. The
review of the literature does not show any publication about heritability in
both soriasis and benign migratory glossitis and prevalence of psoriasis in
the Brazilian population.ObjectiveThis research was carried out in order to determine the prevalence of
psoriasis and benign migratory glossitis in the Brazilian population from a
Brazilian sample, as well as the heritability in these conditions.MethodsSix thousand patients were studied from the records of the outpatient
dermatology department. The sample had 129 patients with cutaneous
psoriasis, 399 with benign migratory glossitis without psoriasis and a
control group with 5,472 patients. After data collection, the statistical
analysis was made using Woolf, Chi-square and Falconer tests.ResultsThe prevalence of psoriasis was 2.15% and the benign migratory glossitis was
7.0%. The prevalence of benign migratory glossitis in the psoriasis group
was high (16.3%), and that was statistically significant. Family history in
the psoriasis group was 38% for the condition itself and 2,75% for benign
migratory glossitis and in the benign migratory glossitis group was 17.54%
for the condition itself and 1.5% for psoriasis. The study of heritability
was 38.8% for psoriasis and 36.6% for benign migratory glossitis, both with
medium heritability.Study limitationsThis study was only in the state of São Paulo.ConclusionThis is the first publication that quantifies how much of these conditions
have a genetic background and how important the environmental factors are in
triggering them.