My LO's bottom half turned red all of a sudden a month ago. I was using Sudocrem, but it wasn't working, so I tried Metanium, but that didn't help either. I took her to the GP and was prescribed Timodine cream - it worked a treat! After a few days of use, it went down, and we switched back to using Sudocrem. Also, we gave lots of nappy-off time, and stopped using baby wipes and went back to plain old cotton wool and water.