I know this has been discussed repeatedly, but I'm just adding my tuppence worth.
A few months ago, I saw some posters recommend Caroline Hirons. I read quite a bit on her blog and changed my skincare a bit, hoping for an improvement. First few days were good, I stopped using the harsh foaming cleanser, threw out the oil cleanser that was made with mineral oil, and stopped using my cheap version of the Clarisonic. For about a week my skin was softer and smoother. Over the past few months though my skin has got worse and worse, and I just thought it was my age. I've had massive spots, and dry flakey itchy skin all at the same time. I had a lightbulb moment about ten days ago when I realised that the decline in my skin seemed to coincide with following her advice.
Last week I got hold of some black African soap, as recommended by another poster, and lo, the dry, flakey skin is starting to disappear, and for the first time in months I don't have loads of new spots working their way to the surface.
So, whilst I appreciate that her advice has been very useful for other people, it gets a big thumbs down from me.