THE PRESENT INVENTION RELATES TO AN ANTIBACTERIAL COMPOSITION, PREFERABLY FOR TOPICAL USE, COMPRISING TRIETHYL CITRATE AND A PEPTIDE CONSISTING OF 15 AMINO ACIDS OF SEQUENCE FAKALKALLKALKAT-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 HIDRADENITIST ATOPIC DERMATITIS CHARACTERIZED BY COLONIZATION BY STAPHYLOCOCUS AUREUS, IMPETIGO, INTERDIGITAL INFECTIONS, FOLLICULITIS, BOILS, POST-TRAUMATIC INFECTIONS, AND BURNED SKIN INFECTIONS. (FIG. 7)