My 20 yr old girlfriend has had severe acne ever since going vegan over a year ago, I am not sure if it is the cause or just a correlation but I need advice. [Acne]

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Hi I am a dude who doesn't have a skincare addiction. My girlfriend does however, because she has had severe acne for over a year. She just so happens to have gone full vegan around the same time, which leads me to believe that they must be related. Now listen I have nothing wrong with veganism, I don't eat much meat myself, and when I do it is cruelty free poultry, or sustainable seafood. I just have a feeling that her not eating any type of meat or dairy must be having an effect on her hormones, or something, which is causing her acne. A year ago her face was as clear as a baby's. She has gotten very very self conscious since getting this acne, and barely leaves the house now, and has had multiple emotional breakdowns. The acne seems to be classic hormonal acne, mostly on her cheeks, nose, lips, and chin. None on her forehead, chin, jaw, neck, etc. She tries to eat a well balanced vegan diet, and supplements with B12 and iron. She has tried all sorts of natural and un natural vegan skin care products and oils to try to get rid of this acne and nothing works. I have tried to convince her to incorporate eggs or dairy or seafood into her JUST to see if it helps her acne, but she is determined to be vegan. I have also tried to get her to see a dermatologist and maybe have blood tests done to see if shes lacking any specific nutrients or if she has a hormonal imbalance, but shes afraid of getting her blood drawn....... So I am here on this subreddit using a throwaway account asking for advice. Does anyone have any ideas?
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Submitted by bogtogglet