As Doctors, in my experience, regularly misdiagnosed it as
food intolerances,
allergies and stress related conditions
and even latterly as Acne Rosacea, which it looks nothing like!!
I’ve found that the best way to keep it under control is regular daily facial routine, coupled with the daily use of ‘Nizoral’ cream. I’ve only found this available from online US pharmacies, it isn’t expensive and it works very very well.