Hi, I can understand your concern for facial grey hair. Your condition of grey hair is known as Premature canities . This is due to less secretion of melanin at the hair roots. The exact cause is not known but could be related to genetical factors, nutritional factors. I prefer to give a latest serum which contains Phytic acid, Amino acids, peptides & Acetyl Hexapeptide-1. Though long term efficacy is yet obe proved but it has been shown that it protects hair from UV rays causing structural damage i.e. internally & externally along with the prevention of graying. Eat healthy diet and avoid substance abuse like smoking and alcohol. You can meet a dermatologist for best guidance. Take care.