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Obagi NuDerm Products and Enlarged Pores?

I have been using Obagi nu derm system and I really liked my skin.However due to summer I stopped the retin a and continued using the cleanser toner and vitamin C and the exfoderm in the morning and at night I just wash and put a bit of collagen gel. I've noticed my pores are looking really large,maybe it was like that before and I just noticed or is it possible that the use of Aha's everyday enlarges pores? I'm cofused I hope I'm not damaging my skin,overall I used the system for 4 months.

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