Tretinoin 0.05% causing red patches that contrast with non-red skin. Is this a sign of a burn? (Photos)

I’ve started tretinoin 0.05% and have been on it for about a month. I’ve had this redness which forms a clear line down my face for almost two weeks. Is this par for the course or is this a sign of something bad? I’ve covered my entire face with tret so it’s not a patch I have missed that’s causing the difference and it’s the same on the other side of my cheek. Should I continue with the tret or stop before anything worse happens? I’ve been using sunscreen too so it’s not that.