Single handel blade.{Gillette guard} that I use to shave my beard is exactly for three months day by day. It means giving gap one day to another day, exactly 4 times for week and 16 times for month in the same count 48 time in three months. I don't know for what cause I got so many black stains on my face but a skin specialist told because of heavy usage of this Gillette guard blades,each for three months as I said above and same one told  because of hair dying. It means should I not only to stop appling black color to my hair but also much usage of the Gillette blades?