i had few mouth ulcer in my gum and in tongue. I went to medicine shop and bought medicine "pyralvex"and i put on ulcer i used four or five days after one or two weeks i started to feel metallic taste still now i have been metallic taste for three weeks.is it could coz of that oral medicine can anyone answer me please. (also i was took some zinc complex capsules one month ago. Please someone tell me what is reason to feel metallic taste ?thanx