When people get this, invariably they do two things that make it worse. The first is, because they consider it to be dry because they see a crack, they put a moisturizer on and, again, moisture makes the yeast grow even more. Secondly, because it’s uncomfortable, and it burns, and it really feels peculiar, a lot of people take the tip of their tongue and they go like this. And they do it to test it, to feel it, to see, is the problem still there and, interestingly, people do it very often, a couple of times a minute, it’s just a natural reflex. So how do we cure this problem? The first thing is obviously stop licking the corners of your mouth. The second is, get an over-the-counter anti- yeast medicine, such as Lotrimin which has clotrimazole as the active ingredient which is good to fight yeast. Put a little bit on the corners of your mouth four to six times a day, just a very small amount, and then put a little Vaseline or Aquaphor on top so, if you do accidentally touch it with the tip of your tongue, the Aquaphor or Vaseline will keep the moisture away from the problem.
Give it four to seven days to cure the problem. If it hasn’t done that by that period of time, then you should see a dermatologist who will give you a prescription for an anti-yeast in an ointment vehicle which again will help protect against additional moisture which aggravates the problem..
As found on Youtube