Last week I started using Kiehl’s Midnight Recovery Concentrate on my face every night, as part of the 28-day Change Your Skin Challenge. Kiehl’s kindly gave both Camilla and me a full-size bottle of the overnight anti-ageing elixir (which, if used every night would last us three months at least) to test and report back on. I already used KMRC as part of my night-time beauty routine but alternating it in a three-day cycle with Alpha-H Liquid Gold and a regular moisturiser. I had a suspicion that it was causing me to break out so I was somewhat hesitant to…