I concur with Londres70.
"Leaving it" is not an option.
Users of isotreinoin (Accutane) harbor much more staphylococcus bacteria than others in the general population. I am a victim of Accutane and have to take Bactrim daily to combat infections all over my body.
I would recommend treatment with Flucloxacillin and not just "leave it."
She is just taking the contraceptive for menstrual regulation, correct? I am asking this because while taking the ATB the contraceptive effectiveness against pregnancy will be decreased, so another form of birth control should be used as well, e.g. condoms. If she is not sexually active, no worries.