Angular cheilitis and head cold- too many vitamins? Causes anyone?

Wow that is exactly what happened to me in January it was right when I was getting over a cold. and now last week the angular cheilits came back, and I have been reasearching and also asking questions on here, because it may be possible Im drooling at night because my nose has been congested since I been pregnant so I sleep with my mouth open, the only thing I have found to clear up the angular cheilits is athletes foot cream, someone suggested it to me and it really worked.