A few years back I ended up getting a bacterial staph infection known as impetigo. Let me start off by saying that it was one of the most unpleasant experiences I have ever had as it spread across my face. It took me two weeks to get into the doctor where they initially prescribed me a drug for coldsores. After a week of taking this drug, nothing was happening, in fact it was getting worse. I ended up going back to the doctor where they told me it was more than likely impetigo. I immediately started antibiotics and within two days could tell that my skin was healing. A week after starting antibiotics, the scabs on my face were practically gone.
That time in my life, I was more than thankful to have antibiotics that worked. It goes to show that a correct diagnosis is critical for giving a patient the correct prescription.