Should I switch from Epiduo 0.1 to Retin-A micro 0.1? The latter I've used in the past and tolerated well.

I was on retin a micro 0.1 for two years (8 months mixed with 0.1 HC for irritation and inflammation) and then started 0.1 solely on its own again. I stopped using it for 5 mo, and my acne returned! Since June now I have deep hard small pimples on one side of my face, acne and also PIH. I was on Retin A micro 0.1 until sep. when my derm recommended Epidou. I tried Epiduo but it didn't work (5 weeks in), Can I switch back to retin a micro 0.1?

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