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I have a skin infection (fungi) and the doctor prescribed me ketoconazole. I have been taking it for 3 days and the infection persists...

It is normal for it to take several days before you see a difference while using ketoconazole to treat a skin infection. Sometimes it can take up to 2 weeks for any changes to occur. If new patches continue to appear in the next 3 days, it would be a good idea to consult a doctor again.