Is it alright to use differin gel together with combiderm?

I have severe acne. On top of that, I have bacterial infection on cysts, pustules and papule that grow together in a bunch on my left cheek and forehead, causing itchiness. The doctor prescribed me oral antibiotics and differing gel and said that combiderm is too strong. But during the day after I have washed off the differing gel, the acne still feels itchy. But because I didn't exactly ASK the doctor if I can use both together, I don't dare to continue using the cream to stop the itchiness.

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