Erythromycin tens to be a second line antibiotic for acne, along with trimethoprim, so well worth a try. If they fail, something very effective is Isotretinoin, also known as Roaccutane. Hope this helps.
Yeah I was using minocycline in highschool, it worked really well just be careful because I found that it can dry out your skin esp. in the winter months.
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