Inhouse Pharmacy (UK) BACTROBAN ointment contains mupirocinBACTROBAN ointment contains mupirocin (2% w/w) as the active ingredient. Mupirocin is an antibiotic. Antibiotics work by killing bacteria, which can cause infection. BACTROBAN ointment is used for the treatment of certain types of skin infections such as eczema, psoriasis, herpes, wounds, lacerations, insect bites, abrasions, minor burns etc. BACTROBAN ointment is for use on your skin only.