This is my 4th week on 20mg of Roaccutane once a day, and I haven’t noticed anything beneficial. My skin is little red, dry, and my lips are chapped, but no improvement in the acne. In fact, I keep breaking out as much as before (painful nodular bumps on my chin). Is this normal? Does anyone know when I should start seeing a change? Could it be that my dose is too low? I was on the generic isotretinoin 3 years ago, and I believe I saw results quickly (I don’t remember). Perhaps because this is my second time on the drug my body is immune to it or something. Please offer some advice.