I think with Eryacne you'll notice a difference, plus it's a little bit more abrasive than differin, which means you should probably use moisturiser with a combined sunblock. Yeah Differin was what i used when i was younger, i found it kind of helped but that my body got used to it? After trying heaps of things i went onto Roacutane, that was about 4 years ago. My skin isn't perfect, but i find drinking heaps of water, exposure to sun, exfoliation, and washing myself with more gentle soaps (like the BodyShop TeaTree Oil) really helps. I think mine is more hormonal now than anything, which means for me that there's not a lot that can be done. Other than the pill, which makes me gain weight, and i also don't trust the long term effects of it.