Using isotretinoin 20 mg per day from 6 weeks and no effect?

I am 25 years old girl and i have 73 kgs of weight. I am using isotritinion 20mg daily at night since 6 weeks. But i see no change in acne. What to do? I am so worried. I hate myself whenever i see myself in mirror. Please help!!! I am having pus/septic pimples also and redness on cheeks. My lips crack. For that i use glycerine over my lips because vaseline doesn't work over my cracked lips. Help???

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