Nothing! Like absolutley nothing. I had no irritation from this product, or dryness. The only thing is that the gel and liquid can feel sticky when setting into the skin. 

First time i used this product, i used it for a week straight, as it said to use daily on the instructions. This product made my large pores shrink by a drastic amount and it really helps with the blackheads that form in my t-zone. I finished the bottle of the liquid version and have now moved on to the Gel.  I use this about 3 time a week now because it has already helped me out a ton. 

Paula's Choice - colacare review for Skin Perfecting 2% BHA Liquid

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