Geographic tongue: a manifestation of pustular psoriasis?

lesions of the oral mucosa are frequently described in association with pso riasis, particularly in the pustular type. Controversy surrounds the questi on whether mucosal lesions can be considered as oral manifestation of psori asis. Two patients presented with concurrent pustular psoriasis and mucosal lesions with the characteristic picture of geographic tongue. Histopatholo gy of the mucosa showed typical features of psoriasis such as marked acanth osis, clubbing of the rete ridges,focal parakeratosis and neutrophilic infi ltrates. There was parallel improvement of the skin and the mucosal lesions with systemic retinoid treatment. On the basis of the histopathological fe atures and the clinical course we favour the hypothesis that geographic ton gue is an oral manifestation of pustular psoriasis.