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What can I do for a corner of the lip that is cracking and causing a red and painful corner of the mouth?

To treat a cracked corner of the mouth causing redness and pain, you can apply an antifungal cream to the affected area. There is a lip cream called CICAPLAST LEVRES by La Roche Posay that is recommended for cracked lips and corners of the mouth. It is a repairing and hydrating cream that is safe to use during pregnancy. Other lip balms like Lypsyl or Blistex can also be used without any issues.