A substantially pure, isolated antigenic protein originating in fungi of the genus Malassezia, characterized by having an avidity with IgE antibodies originating in allergic patients; antigenic fragments originating in said protein; a specific antibody against said antigenic protein or fragments; a diagnostic, therapeutic or prophylactic agent for malassezian allergic diseases containing the antigenic protein or fragments as the active ingredient; a novel recombinant malassezian antigenic protein; a gene coding for the protein; and epitopes of the protein.