If you’re starting a ketogenic diet or doing an extended fast, you may have developed a rash and don’t know why. Maybe you’ve Googled the symptoms of ketosis and think that the rash means ketosis is bad for you. I personally first experienced keto rash is from my 21 days extended water fast, around day 8/9 I started to get this rash all around my ribs/under my chest area and back as well. That itchy rash you’re experiencing is called “keto rash”, and it’s a normal side effect experienced by many (but not all) new keto-ers. It can definitely be annoying and somewhat embarrassing, but it’s not dangerous.