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cold sore become infected with bacteria to cause yellow crusting?

I am prone to cold sores, getting one a year every year. However, this time round all started off as normal but the usual cold sore process seemed to stop and instead i found several more tiny blisters forming. Above my lip has now gradually been covered in a layer of yellow scabbing/crust that is incredibly itchy. I have been to the GP who gave me antibiotics but so far it's been 4 days of use and no difference at all.
It seems to match part of the description of impetigo but certainly not the pictures online. I'm at a bit of a loss and really want it cured as it has almost been 3 weeks now. Hope someone has  an answer!
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