All tretinoin products work by speeding up cell turnover rates, rapidly exfoliating the skin and decreasing the buildup of dead cells within the follicle. This, in turn, reduces the formation ofcomedones. Retin-A also makes existing blackheads less sticky, helping the blockages make their way to the surface to be expelled.
Like most acne medications, Retin-A takes time to work. You will likely not see any change in the skin for several weeks, and it may take several months for noticeable improvement to occur.