Could sotret and external anti-acne creams be used together? Can it cause acne scars?

l'm a 21 years old girl 49kg I had sme big acne in my face only since four months they left scars not too deep but they have some doctor prescriped me sotret. I've been using sotret 10mg per day for a month now and last week my doctor told me to apply an external anti-acne cream on my face too..she saidmy acne aren't so sever and I'm too thin to take 20mg .but after I used this cream my skin became so dry and peeling off so badly on my left cheekbone leaving scars what should I do?

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