Is this normal with Differin Gel?

I'm 2 months into using Differin gel. I've

had an onset of dryness, flaking, redness and irritation. Much more than I did in the first 4 weeks. However, it's only around the skin below the corners of my mouth.

I've cut cleansing to every other night.

The only new product I've introduced to my routine is HadoLabo Premium Hyaluronic Acid. I'm not sure if this is normal or not. I have visible change in skintone there, also. Thanks!