Incredibly dry skin, terrible texture right now. Is this normal?

I have been using Tretinoin .05% regularly for about 2 months now. Most of my face is making great improvements both with fine lines and cystic hormonal acne. However, my lower mouth area and chin have not only been red and peeling (which I expected), but it is very bumpy with small under the skin zits? Now my chin has the texture of a Pringles potato chip. Is this just my skin purging and this will improve? I am 34 and did not have any fine lines in this area prior.