Roaccutane - when should I start seeing changes? (Photo)

Left pictures shows my skin before treatment, right pictures show my skin today. I am not seeing any improvements. I weight 68kg, I'm 165cm height, and I have been on 40mg since I started my treatment. I knew my skin would get worse before it gets better but it has stayed bad, I'm beginning to think going on roaccutane was a bad idea. When should I start seeing changes? I'm losing hope!

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