Oral psoriasis:case report in a patient without skin lesions

Background: Psoriasis is a chronic inflammatory genodermatosis characterized by erythemato-squamous lesions. In literature, few cases of psoriasis affecting oral mucous membranes are reported. Materials and methods: a case of a 72-years-old woman with persistent burning symptoms on the dorsum of the tongue with an erythematous squamous area was reported. An oropharyngeal swab and a scalpel incisional biopsy were performed. Results: Histopathological examination described the presence of hyperparakeratosis, acanthosis, papillomatosis and Munro microabscesses. Clinical and histopathological findings are compatible with a diagnosis of oral psoriasis. Conclusions: Psoriasis lesion rarely affects oral mucosa. When it occurs, it is important a cooperation between oral pathologist and dermatologist.