Reader John was kind of enough to post this comment:
… Read MoreI also developed this skin rash after going into ketosis. After a couple of misdiagnoses I now even have a histopathology report that would support the diagnosis of prurigo pigmentosa (though no dermatologist I spoke with was aware of the association with ketosis). I did not look into the diagnosis until now, because it went away with sun exposure quite rapidly leaving behind hyperpigmented areas that are slowly fading away. I also had a low 25(OH)D level (Vitamin D) at that time.