A Bartholin's cyst
is treated like any other cyst, with antibacterial therapy.Fucidin
is a topical ointment used to treat superficial bacterial skin infections. It will be effective in treating your condition. But if it has been ineffective in completely ridding you of your presentation then there is an option of adding systemic antibiotics to your regimen. Please consult your doctor about this.
Continue with the sitz baths, you could also add some epsom salt to your baths. Application of warm compresses during the day will also help.
Please continue with the fucidin and consider the addition of the systemic antibiotics after discussing this with your doctor.
Hope this helps.