While the keto diet can help you lose weight, it also has a ton of weird side effects, like the keto flu, diarrhea, and keto breath. Now, there’s apparently another one to add to that list: keto rash—and it sounds even worse than walking around with breath that smells like acetone. What is the keto rash? The keto rash—a.k.a. prurigo pigmentosa—is an uncommon inflammatory disease that’s often characterized by red, itchy bumps on the neck, back, and stomach, according to a literature review on the condition in the American Journal of Clinical Dermatology. While the rash’s exact cause is unknown,...