Staphylococcus AureusThe present invention relates to an antibacterial composition preferably for topical use comprising triethyl citrate and a peptide consisting of 15 amino acids of sequence FAKALKALLKALKAL NH2 wherein F is phenylalanine A is alanine K is lysine and L is leucine particularly for the treatment of acne suppurative or non suppurative hidradenitis atopic dermatitis characterized by colonization by impetigo interdigital infections folliculitis boils post traumatic infections and burned skin infections.