I was told it was a yeast infection by many drs-but the yeast medication never helped! I finally did a little research
and found out that it could be a vitamin B
deficiency-so now when I get those painful splits in the corner of my mouth, I take a vitamin B complex and it usually is cleared up by the next day-if it is really bad, it takes 2 days. I continue to take the extra B complex vitamin for a good 2 weeks, just to make sure they don't come back. I rarely get them now.