Geographic tongue, fissured tongue, and angular cheilitis associated with the diagnosis of psoriasis in adult patients: a cross-sectional study

Objective. This work aimed to determine the frequency of geographic tongue, fissured tongue, and angular cheilitis associated with the diagnosis of psoriasis in adult patients. Material and methods. This was a cross-sectional study and was conducted between February and April 2023, including a total of 120 adult patients (60 with psoriasis and 60 without psoriasis) from the Dermatology Service at “Victor Lazarte Echegaray” Hospital. To determine the intra- and inter-rater reliability of the oral clinical measurement, a pilot study was conducted with 22 participants, resulting in Kappa values above 0.91. On the other hand, the diagnosis of psoriasis was made by a dermatology specialist. The Chi-square test was used to analyze results, considering a significance level of 5%. Results. Frequency of fissured tongue was associated with the diagnosis of psoriasis (p=0.023); this association also was found in patients aged 35 to 64 years (p=0.020), nail psoriasis (p=0.037) and late-onset psoriasis (p=0.03). Conclusions. The fissured tongue is associated with diagnosing psoriasis, mainly in patients in the 35-64 age group and with nail psoriasis and late-onset psoriasis.