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Objective: We aimed to determine if there was any association between geographic tongue (GT) and fissured tongue with ABO blood group among adult psoriasis patients in Saudi Arabia., Study Design: This hospital-based cross-sectional study included 100 consecutive new adult patients diagnosed with psoriasis and 100 case-matched participants in the control group (nonpsoriatic). Sociodemographic and dermatologic parameters, intraoral lesions (GT and fissured tongue), and ABO blood grouping and immunoglobulins were recorded and evaluated using χ 2 or Fisher's exact test., Results: A total of 74% of patients had an early age of onset, and 48% of them reported this disease in their parents. A total of 76% of those with generalized psoriasis had plaque type, whereas 78% with the localized type had pustular lesions. A total of 70% of psoriatic patients had O Rh-positive blood; 63% of tongue lesions seen in these patients were GT, and it was most prominent in O Rh-positive (64.28%) and O Rh-negative (62.50%) blood types. GT was prevalent among women (75.6%)., Conclusions: This study found a positive association of both GT and fissured tongue in this population of adult patients with psoriasis compared with a case-matched control population without psoriasis., (Copyright © 2019 Elsevier Inc. All rights reserved.)