"You need to keep the lips moisturized with Aquaphor or Vaseline to prevent more cracking," says Green. Topical anti-fungal creams (yep, like the kind used for athlete's foot) can also help clear up the underlying fungal infection, and steroid creams like Cortisone can help with inflammation.
If you're prone to the condition or you just healed and want to avoid a relapse, Karen even suggests using a tiny bit of diaper rash ointment in the corners of your mouth before bed to prevent saliva from accumulating.
BUT be sure to check with a doctor before trying any of these, since they can tell you the right amount and frequency for applying. And, obviously, only use a tiny bit in the corners of your mouth and don't actually ingest it.