To obtain a cosmetic or a dermatologic composition applicable to skin, a keratin fiber, a semi-mucous membrane and/or a mucous membrane.

This cosmetic or dermatologic composition applicable to the skin, the keratin fiber, the semi-mucous membrane and/or the mucous membrane combined with an antibacterial protecting system including 1,2 pentanediol contains water dispersion of film forming polycondensate particles made up of a material selected from an anionic, a cationic, a nonionic and an amphoteric polyurethanes, an acrylic polyurethane, a polyurethane-polyvinylpyrrolidone, a polyester-polyurethane, a polyether-polyurethane, a polyurea, a polyurea- polyurethane, a polyester, a polyesteramide, an alliphatic polyester, a polyamide, an epoxyester resin and their mixtures.