The difficulty smiling, for me, only occurs if I let the skin build up and don't put any moisturizers on my lips. So then the top layer gets hard and thick and doesn't stretch with the rest of my lips, leading to pain and cracking. But if I keep using Aquaphor or something it keeps the skin soft, so I don't have the smiling problem. I don't get cuts on my lips either. Do you still exfoliate or have you been letting the skin thicken?