Lichenoid Tri-Keratosis (Kaposi-Bureau-Barrière-Grupper)

A case of peculiar eruption in a 43-year-old man is reported. The eruption was papular, polymorphic, hyperkeratotic, and lichenoid appearing on 4dry skin with patches, linear striation and Sverrucous hyperkeratosis. The histological picture showed a lichenoid lymphohistiocytic infiltrate with hyperkeratosis, hypergranulosis and parakeratosis ‘in cutem penetrans’. The general examination and laboratory findings were normal. Only seven cases have been previously reported. The first one was described by Kaposi, and in four of them there were also mucosal lesions. The differential diagnosis is made with the hypertrophic lichen planus and with the lichen of toxic origin.